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However, it should never be attempted to string steel strings on a classical guitar, as they generate very high tension and forces that the neck of the classical guitar is not designed to withstand. New strings provide a wonderful sound and are a pleasure to play, so we recommend changing the strings "too early rather than too late" if you're unsure.
Explaining shortly Classical Guitar Strings
Classical guitar strings are primarily made of nylon, with the G, B, and high E strings being pure nylon, while the low E, A, and D strings use nylon wound with silver-plated copper wire. These consist of three high-tensioned treble strings and three low-tensioned bass strings.
There are also treble strings made of carbon (carbon fiber). Even though they have approximately the same diameter but they produce a brighter and more metallic sound compared to nylon strings. Their outstanding feature undoubtedly lies in their performance and durability.
The classical strings are available in various strengths, with the differences not in diameter but in the composition of the nylon.
In classical guitar strings, it's not the thickness of the individual strings that matters but rather the tension strength:
Strings with increased tension produce a louder and more penetrating sound but require greater pressure. The lower the tension, the easier they are to play.