Nylon strings, which are far more consistent than natural/gut strings are now almost exclusively used for most string instruments, including the classical guitar. The three bass strings consist of a multifiber nylon core which is wound with wire. The three treble strings are either plain or polished nylon.
Pyramid Strings offers both plain and polished nylon options. Nylon is a thermoplastic material that belongs to the family of synthetic polyamides and is characterised by its high firmness and tenacity. It has good chemical resistance and workability. For polished nylon, the additional processing makes the strings more precise and consistent in diameter. The advantage of this treatment is that you're able to play more dynamically and expressively. Polishing the nylon does not affect its durability.
The German trade name “Perlon” is identical to the American trade name “Nylon”. After the 2nd World War, the name “Nylon” became generally accepted.
The music strings industry today uses mainly nylon and carbon strings. Carbon is also called PVDF (polyvinylidene fluoride) and more commonly called PVF or fluorocarbon. It belongs to the class of fluoride polyamides which are translucent but appear milky or cloudily.
Carbon has a slightly higher density and tension than nylon; so, when replacing a nylon string with a carbon string, the new carbon string should be a thinner gauge. Carbon flexural rigidity is less and the string is easier to bend.
Carbon strings are more alive and reactive than nylon strings. The harmonics are increased and the sound is more brilliant. The brilliant carbon sound may appear unusual at first but will be perfect for the musician looking for a brighter string with extra attack.
The bright and polished carbon strings have the same differences as the nylon strings. The polished carbon strings are processed just like the polished nylon strings.
The durability of Nylon is unusually good. Carbon has a more brilliant sound. The difference in sound between the two plastics is due to the different densities.