Discover yourself why D'Addario's Prelude strings are a favorite with so many teachers, students and parents! Solid steel core makes Prelude strings utterly dependable, and at a price that will not break the bank. Unaffected by temperature or humidity, quick tuning, stable pitch, and long lasting. Strong, bright tone, without edginess. Nickel and silver winding, with solid steel E string. Medium gauge, suitable for all players and instruments.