Infeld Blue violin strings radiate strong power and brilliance. Mix and match within 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! The E string has a removable ball so that it can be loop or ball end. The A,D and G are all ball end. The E is Tin Plated, the A and D are Hydronalium and the G is Silver.