D'Addario Prelude Viola String SetSolid steel core D'Addario Prelude Strings are an excellent choice for student and amateur players and a number one choice of teachers because of their warm tone, durability, and excellent value for the quality of string. These solid steel core strings are very responsive to the bow and unaffected by temperature and humidity changes. Preludes are bright without the shrill sound of traditional steel strings, producing the warmest tone available in