P41A021 Pirastro Perpetual violin string set medium P31A121 Pirastro Perpetual violin string E-1 medium 26 P41A221 Pirastro Perpetual violin string A-2 medium P41A321 Pirastro Perpetual violin string D-3 medium P41A421 Pirastro Perpetual violin string G-4 medium P31A131 Pirastro Perpetual violin string E-1 heavy 26 P31A221 Pirastro Perpetual violin string A-2 medium