The strings are made of steel, very precisely coated with nickel, and each string is also coated with a thin layer of polymer. The strings have a bright clean tone, great intonation and hold tuning. At the same time, the thin polymer coating extends the life of the string up to 3 times. The coating is so thin and noble that you will not feel that the string is coated while playing. The strings are suitable for all genres from metal to blues or jazz. In addition, a free "e" string is included in each set, for the greater comfort of the guitarist.