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  • Martin Authentic Acoustic SP 80/20 Bronze 12-56 Acoustic Guitar Strings
  • Martin Authentic Acoustic SP 80/20 Bronze 12-56 Acoustic Guitar Strings

Martin Authentic Acoustic SP 80/20 Bronze 12-56 Acoustic Guitar Strings

(3 Reviews)
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Authentic Acoustic / SP, Bluegrass
Set gauges
12, 16, 25w, 35w, 45w, 56w
Wrap material
80/20 Bronze
Round Wound
Core shape
Hex Core
Plain Steel
Absolute tension
184.0 lbs
Number of strings
6 string
Optimal tuning
Plain wound 3rd
Wound 3rd

Martin Authentic Acoustic Superior Performance (SP); the flagship, and the coveted king of acoustic guitar strings. These strings are made by the top acoustic guitar brand in the world, ie., we know what their ‘MO’ is!

Martin SP strings are made in their own dedicated strings factory in Navojoa, Mexico. Their quality control is flawless with every set coming out just a good as the last, and then packed in modern, long shelf-life ‘flow’ foil wrappers.

The core of each string is high-tensile steel for strength and power which is tin-plated to add corrosion resistance. This gives all sets (whether phosphor or 80/20 bronze) bold and powerful fundamental tones which genuinely enhance any acoustic guitar we’ve tried them on. Premium bronze alloys are used for the wrap wire at specific ratios to provide the best acoustic tone possible for your guitar.

80/20 Bronze - bold, bright, brilliant
Phosphor Bronze - added lo-mid warmth, smoother highs


SKU: MA240

Re: Delivery. All orders placed on weekdays before 3:45pm will be despatched that same day.  All of our delivery options can be found at checkout or on our delivery page.

Re: Returns. We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, please contact us at info@stringsdirect.co.uk.

For further information visit our Returns & refunds page.

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