Warchal Amber Violin Strings 4/4 Set, Ball End E Warchal's Research and Development team. The sound isrich and warm, but still has texture. The strings also feature a distinctivehigh quality silking design. The Amber spiral E string is based on Warchal's newest unique invention, this solution increases the longitudinalelasticity of the string, which results in a significantsound improvement andno whistling. Set / Violin 4/4 Spiral e'' - Steel,increased elasticity,with ball enda' d' g with W-Core(synthetic core)a' Hydronalium woundd' Hydronalium-Silver woundg Stainless Steel-Pure Silver woundThe WarchalAMBER string set has been developed with the aim of achieving the sound quality of the best gut strings without any tuning instabilities. The special synthetic core offers thesound quality of gut but givesexcellent tuning stability.The set featuresW-Core, a completely new core material developed by