P411041 Pirastro Obligato violin string set 3/4+1/2 medium P313741 Pirastro Obligato violin string E-1 3/4+1/2 medium P411241 Pirastro Obligato violin string A-2 3/4+1/2 P411341 Pirastro Obligato violin string D-3 3/4+1/2 medium