Set / Violin 4/4, Spiral Steel "E" string with increased elasticity, with Ball End. "A", "D", and "G"strings have a W-Core (synthetic core). "A" string made with wound Hydronalium. "D" string made with wound Hydronalium-Silver. "G" string made with wound Stainless Steel-Pure Silver. The Warchal AMBER 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 the sound quality of gut but with excellent tuning stability.The set features W-Core, a completely new core material developed by Warchal's Research and Development team. The sound is rich and warm, but still has texture. The strings also feature a distinctive high quality silky design. The Amber spiral "E" string is based on Warchal's newest unique invention, which increases the long elasticity of the string, resulting in a significant sound improvement and no whistling.