What’s a wound 3rd and do I need one?

Sets with a wound 3rd string

Throughout your guitar playing life, chances are you may never have considered whether your 3rd string should be plain or wound. The vast majority of sets sold nowadays come with a plain 3rd (for electric guitar anyway) and comprise of 3 plain strings and 3 wound strings (or more if you play 7, 8, 9-string etc.). The use of a wound 3rd in electric sets is certainly not as popular today as it was many moons ago.

In fact, before the 60’s, string gauges were pretty heavy and came with a heavier wound 3rd string which often proved tough on the hands… even for players with ‘Stevie-Ray strength’ fingers. In the 60’s, there became a growing trend towards players wanting to use lighter gauge strings. In order to achieve a lighter set, they would often discard the lowest 6th string from their heavy sets but replace it with a thin banjo string as their high E, thus creating a lighter overall gauge which now included a plain 3rd. In fact, it was quite common for players to use a very light plain 3rd string, allowing them to make big bends which were previously achievable with such ease.

That being said, there is still demand for sets with a wound 3rd string. You’ll tend to find these are mostly found in heavy gauge sets. Jazz players tend to use heavier gauges, which is why you’ll often see many flatwound sets (a jazz player’s staple) accompanied by a wound 3rd string.

So what is the difference between a wound 3rd string and a plain 3rd string? What are the different tonal properties and how do they feel? Below, we’ll try and offer up answers to all of these questions enabling you to make a more informed judgement on whether you want to take the plunge, roll back the years and try something a little bit different.

What’s the difference between a wound string and a plain string?

In short, a plain steel string is simply one piece of cylindrical steel wire with a ball end attached at one end. The thickness (diameter) of the steel dictates the string’s gauge. On the other hand, a wound string is made up of two parts; a central core wire and an outer wrap that travels around this core, again with a ball end attached at the end. The combination of these two parts makes up the overall gauge of the wound string.

So, why do sets contain a mix of wound strings and plain strings? Why are sets not made up of solely wound strings or just plain strings?

If a set of strings was to be made solely of either wound strings or plain steel strings, in reality, they would neither be practical nor tonally pleasing in either case. Let us explain:

As we’ve previously mentioned, a wound string is made up of two components; its central core and its wrap wire and the combination of these parts when added together create the overall diameter (or gauge as we refer to it) of the string. So if we were to take a standard .026” gauge D-string, this could be made up of a .010” central core with a wrap wire of .008” (see below)

Core Dimensions of a wound string

Likewise, a .036” gauge string could be made up of a .014” core with a .011” gauge wrap wire and a .046” gauge string could be made from a .018” core with a .014” gauge wrap wire.

As you can see, even the thicker gauge strings in our sets are made from pretty thin gauge cores and outer wire. With that in mind, if we were to have a wound .010 string (or lighter), this would perhaps require a .006 gauge core with a .002 wrap… ultra-thin stuff here!! Too thin in fact and a string constructed in this way simply wouldn’t be able to withstand the tension required to get close to pitch without breaking, and if it did reach pitch, chances are it wouldn’t cope with much playing before eventually snapping on us.

So on the flip side of this, what about a full set of plain steel strings? Well, these wouldn’t be much better either we’re afraid.

As string gauge goes up, the tension in the string increases too. If we were to have a plain steel .026”, .036” and .046” as our thicker strings, the tension in these strings would be so high and the strings would be so stiff that they’d be pretty much nigh on unplayable. They’d also sound pretty terrible too!

In fact, to test this out I replaced the wound 4th on my Telecaster (.026) for a plain 4th string of the same gauge. Straight out of the packet, I could immediately see and feel the difference in tension between the two. Held up next to each other, the plain string stood proud whereas the wound string just flopped over.

Played open with no fretting or playing big open chords sounded fine. However, where the difference became apparent was fretting further up the neck. In the higher registers of the fretboard, the string started to sound out of sync with the rest of the set and developed tuning issues. Even played by itself higher up, the string sounded very odd, lacked sustain and when played as part of smaller 2-3 note chords, it sounded just plain strange (pun intended)!

So what about a wound 3rd? What do they sound and feel like? Are they right for me?

Being a light gauge player, for me, wound 3rd strings had always been reserved for heavier gauged sets or strings specifically tailored towards Jazz players, but I tried a variety of wound 3rd gauges on my telecaster (ranging from .017 up to .020).

Opened DAddario Nickel Wound Single Strings

Upon first playing a wound 3rd, I must admit, I was pleasantly surprised. They delivered a nice warmth, rounding out the tone of the set nicely. However, bending the wound strings wasn’t particularly easy. Naturally, the .017 was the most forgiving, however, the heavier gauges like the .019 and .020 were particularly tough going. It always felt like they were ‘fighting back’ and as a result there was always the danger of them slipping from under your fingers if you’re not careful. If you like to bend the strings and be a bit more expressive with your vibrato, using a wound string wouldn’t really help you achieve this.

The wound 3rds certainly gave the set a darker character and a less ‘jangly’ tone as they didn’t have that ‘snappiness’* you usually get from plain strings. (*Granted, ‘snappiness’ is probably not the best adjective to describe a guitar string.. Gulp!).

Despite this, they delivered a nice warmth that would be desirable for some players, particularly those solely playing rhythm guitar or those trying to tame a bright sounding instrument. If you’re a guitar player that’s exclusively playing chordal work, a wound 3rd would definitely be an interesting avenue to explore.

Some guitarists often find plain 3rd strings to be a little harsh and the G stands out too much against the other strings. If you find yourself in this situation but don’t necessarily want to opt for a lighter plain string, it might be worth considering the use of a lighter wound gauge such as a .017. This would mellow out that shrilly (definitely a word…No seriously it is!!) tone whilst still retaining some flexibility to bend the string.

What about acoustic guitars?

If you play the acoustic guitar, you’ll be well aware that most acoustic sets come with a wound 3rd as standard, however, some of the bigger string manufacturers such as Ernie Ball, D’Addario and Rotosound also make sets available with a plain 3rd.

It’s worth noting that these sets typically come in a lighter overall gauge (10’s and sometimes 9’s) and the inclusion of the plain 3rd string means the top 3 treble strings (G, B and E strings) mirror the top 3 strings of a standard electric set.

Various Acoustic Guitar Sets with a Plain 3rd

I tested the Earthwood Rock ’n’ Blues 10-52 (plain .017) Set by Ernie Ball on my Sigma Acoustic. Initially, simply strumming chords on these strings didn’t feel or sound too dissimilar to a standard set with a wound 3rd. The plain .017 had more of a snappier tone to it and playing single note lines and bends were noticeable easier in comparison to a wound G. If you like to play your acoustic guitar in a similar fashion to your electric, having a plain 3rd would certainly be advantageous.

However, what the plain .017 did seem to lack was the oomph and punch that a wound 3rd delivers. After changing back to a wound 3rd, immediately, I noticed a marked difference and the guitar seemed to recapture it’s warmth and rich character. It gave a much fuller sound and (to my ear) a better overall tone. I was certainly surprised by the impact this seemingly minor change had.

If you did fancy trying a plain 3rd on your acoustic guitar, our recommendation would be to buy an additional plain 3rd string next time you buy a set of acoustic strings. We’d also recommend putting this on your set first, that way, if you don’t like it, you always have your trusty wound 3rd ready to replace it if it’s not to your taste :-).

Chris’s Tips

Although this appears to be a fairly simple and innocuous change to make to a guitar, we consulted our guitar tech Chris Ward to see if there’s anything technical we need to be aware of when changing our G-string from a plain 3rd to a wound 3rd.

Chris says;
“Wound strings and plain strings intonate differently from one another. As a result, you’ll often find that you’ll need to make an intonation adjustment on the G to avoid any tuning issues.

It’s also worth being mindful that if you have a fixed compensated bridge (like those found on a Gretsch or Les Paul Junior) most are purposely configured for a particular string layout (e.g. 3 plain & 3 wound strings, or, 2 plain & 4 wound strings). If you do have a bridge like this and you’re thinking of changing from a plain 3rd to a wound 3rd (or vice-versa) be mindful that intonation issues can’t be easily changed as the saddles are fixed in position. As a result, if you do come across intonation issues, you may need to source an alternative bridge that accommodates this change in string set up.


We hope that these couple of experiments have given you an insight into the variations between plain and wound 3rds. For today’s modern style of playing, it’s clear to see why plain strings are more widely used in most sets and why wound strings are preferred to help deliver that breadth of tone in the low end.

If you did need any further guidance on this or any other topic, please feel free to leave a comment below or drop us an e-mail… we’re always happy to help out where we can.

Thanks for reading, see you next time!



  • Barrie Stones

    Having learned to play in the late 50s and early 60s I liked to use flatwound strings with a wound G string for the warm tone they gave. However, as I became aware of blues, trying to bend strings was a pain! My dad’s banjo soon lost it’s 1st string and guitar lost its thick 6th. I can’t remember when lighter guages became available, but I’ve used Ernie Ball slinky or super slinkies for over thirty years.

    • stringsdirect

      Hi Barrie, thanks for the comment. Glad to hear from one of the guys who used to steal a banjo string to use as their top E 🙂

  • Andrew Butcher

    Really interesting information. Not just great service from Strings Direct but great advice and information too. I bought a set of NYXLs recently with a wound 3rd for a Godin A6 Ultra. They work really well.

    • stringsdirect

      Hi Andrew, Thanks for the kind comments. Glad you like the blog and nice to hear you’re getting on with the Wound 3rd too. Can’t go wong with the NYXLs! 🙂

  • David Walker

    I tried the Ernie Ball Earthwood rock/blues set, on an acoustic dreadnought. The intonation was horrible – not a problem on most electric guitars but far more complex to solve on an acoustic.
    By a happy coincidence this article arrived in my inbox, I’ve been restoring an old Epiphone acoustic, and am planning on using a soundhole pickup, tha I had previously used on another guitar. It’s an artec maget pickup, however the wound strings only have a steel core on acoustic strings I’ve seen, so I had problems getting enough output and the tone was poor (the magnet only sensed the core. So I’d considered trying to find a set of steel acoustic strings – including the wound E,A,D and for intonations sake a wound G as well.

    Do you know of a good set of fully steel strings for acoustic (not bronze or phosphor, the wraps steel also), or perhaps more economically maybe suggest a set of of 10-52 /11-52 electric steel strings that I could swap in a separately bought steel wound 3rd G that would sound consistent for the set?

    Any suggestions would be welcome.

    Has anyone else had this problem with magnetic soundhole pickups on the bronze wound strings, If so how did you get round it? Thanks

    • stringsdirect

      Hi David,

      Thanks for your comment. This is a common issue when it comes to sound hole pickups and bronze strings. The pickup is only picking up the core (which as we discussed in the blog, is usually pretty thin, hence the low output). The common resolution would be to opt for a set of nickel plated steel strings (standard electric set). If you wanted a set with a wound 3rd, you could buy a standard set with a plain 3rd and buy a wound 3rd as an extra string to replace the plain 3rd. Alternatively, there are sets that come with a wound 3rd such as the Ernie Ball 10-50 Nickel Wound set or the 11-52 set. If you wanted to try something with a bit more of an “acousticy” tone, the new D’Addario Nickel Bronze 11-52 set might be a nice compromise. The wrap on these strings is made of phosphor bronze but is nickel plated so these may be better for your sound hole pickup. We’ve tried these too, they’re great strings.
      Hope this helps. if you needed more help, please do not hesitate to contact us. Thank you

  • Alan Motion

    Another interesting blog on a subject that I suspect many hadn’t thought about. I have a Taylor T5s and originally strung that with 11’s with a plain third. I have been using a wound third on the T5 for a couple of years now and to my ears it supports a more rounded tone from the guitar.

    • stringsdirect

      Thanks Alan, nice to hear that you’ve been down the plain 3rd/wound 3rd route. Thanks

  • Fascinating , focussing on this 1 string gives a great insight into whats going on with all 6 and also other on other instruments.
    Eg .
    Id been trying to source a plain nylon string to get a low G on my uke….they achieved the note but had no volume and were floppy and thick!
    So I tried a wound string..tension was spot on,volume was good and it was thin enough to work.

    Same sorta principle as in your article…thanks!

    • stringsdirect

      Hi Steve,
      Thanks for the comments. Glad to hear that the principle works the same on your ukulele too. Thank you

  • Pat

    I’ve just bought an Ovation Celeb and play bottleneck Open D.
    I think it’s got a set of mediums on it, the top string being way too jangly even when muted.
    I wanna try something really heavy to get that ballsey sound..
    Could you please suggest….? Many thanks Pat

    • stringsdirect

      Hi Pat,
      Sure, happy to help here. May we ask what gauge you are using at the moment? Many players opt for a heavier gauge when playing slide so you’re on the right lines of thinking.

    • “ you’ll often see many flatwound sets (a jazz player’s staple) accompanied by a wound 3rd string.”

      No you won’t. You’re not going to have one WOUND string in the middle of a FLATWOUND set! Flatwound sets are all flat.

  • Rufus Doofer

    Your string stood proud of the others because you did not file the nut – the nut in an electric guitar is factory filed for a plain 3rd string. A wound string has a larger diameter and will not fit in the notch created by the luthier for the wound string so you should have filed it down for the wound string.

    Also your string did not sound right fretted high because you failed to adjust the intonation at the bridge – the bridge is set up for a flat string and a wound string will need a slightly different setting due to its different tension and diameter.

  • Please ignore my last comment. Being a smartRse. Sorry.

  • Arthur

    Hello, amazing article because it was just what i was looking for, my guitar has a terrible warble sound in the 3rd string (a normal plain 0.17), but when i replaced it with a wound 0.18 but it was really hard to bend my 4 semitones that i usually bend with normal strings….. my question is, do you think a 0.17 wound string would let me bend at least 4 semitones? 0.17w is really hard to find in my city but i cant make some effort to find one, but wil it be worth it?
    thank you for response

    • stringsdirect

      Hi Arthur,
      Thanks for the question. The wound string will certainly be a bit more challenging to bend compared to the plain string. It’s difficult to say if you will definitely be able to bend the string 4 semitones… it might be a suck it and see situation! That being said a wound .017 has around 10-15% less tension in it than a wound .018 so it’s certainly worth a try
      Hope that helps

  • Alan Smith

    Hello. For acoustic guitar, can you tell me what is the lightest gauge /lowest tension set of ( metal) strings available with an unwound G? With thanks.

    • stringsdirect

      Hi Alan,

      Usually a set of 9’s is the lightest acoustic string available. This set of D’Addario EZ890 has a plain .015 3rd string. Hope that helps.


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