For 100 years, Thomastik-Infeld has been producing fine orchestral and fretted instrument strings in our Vienna factory. Every set we make has been precision-engineered and exhaustively tested until we were satisfied that they fulfilled our intentions - and live up to your musical expectations as well. Infeld Blue™ strings radiate strong power and brilliance. Mix and match with in the Infeld Red and Blue string system to realize your sound ideas! The perfectly attuned strings with identical tension enable you to modify your tone and assemble your sound to your individual liking, personal needs and unique style!Infield Blue strings radiate strong power and brilliance. Mix and match with in the Infeld Red and Blue string system to realize your sound ideas! The perfectly attuned strings with identical tension enable you to modify your tone and assemble your sound to your individual liking, personal needs and unique style! Violin set, 4/4 size.