The Pirastro 412821 Tonica Violin D String features a modern update on a classic string. This string features a synthetic gut core made from nylon which produces warm, clear tones. The silver windings add depth to your overall tone, as well as a more comfortable feel. The Tonica strings have a smooth surface that's comfortable for your left hand whilst being responsive to both bows and picking. The medium gauge tension offers an ideal balance between versatility and playability. This D string is designed for full size violins and features a ball tailpiece end.