Pirastro Passione Violin String SetPassione Violin Strings by Pirastro have a gut core with a variety of sound characteristics that respond to the demands of the player. From rich and powerful to sweet and whisper soft, these gut strings produce an incredibly beautiful tone with great tuning stability and long playability. E Silvery steel A Aluminum wound gut D Silver wound gut G Silver wound gut String orders are shipped in 4 4 size and medium gauge with a steel E unless otherwise