Warchal Brilliant 4/4 Violin String Set - Loop End E - Hydronalium D - Medium Full Violin String Set For 4/4 violin Medium Gauge E String: Advanced Stainless Steel - Loop End | A String: Advanced Synthetic Core - Hydronalium Winding - Ball End D String: Advanced Synthetic Core - Hydronalium Winding - Ball End | G String: Advanced Synthetic Core - Silver Winding - Ball End