The Thomastik-Infeld Vision Solo violin string set offers a sophisticated and refined tone that is both warm and clear, with a rich array of overtones. Its quick response to bow strokes and pressure makes it ideal for articulate left hand playing. These strings exude a warm depth and impressive projection, and are highly responsive to varying climates and temperatures. Size: 4/4Tension: Medium E String: Tin plating over a carbon steel core, removable ballA String: Aluminum wound over a synthetic coreD String 1: Aluminum wound over a synthetic coreD String 2: Silver wound over a synthetic coreG String: Silver wound over a synthetic core