Nylon strings
prices on 4 models— standard material for strings used in classical guitars; almost never found in other types of instruments. It is the nylon strings that give the "classic" its characteristic soft and at the same time quite bright and iridescent sound. Separately, we note that metal strings are not suitable for such instruments — they have too much tension, leading to neck deformation (the exception is titanium, but they are very expensive and rare). However, nylon bass strings (starting at 3) usually have a metal sheath, usually copper or silver (see Braid Material).
Despite being thicker than metal strings, nylon strings are very soft, making them great for beginners. Their feature is the tendency to "stretch" for some time after installation; as a result, in the first week or two, you will have to periodically tighten the pegs.