Babolat VS Tonic 15L is a more economical and durable option in the Babolat VS natural gut line. the premium standard for natural gut tennis strings, and is now updated with BT7 technology for 15% better durability. BT7 permits a larger contact surface of the natural gut fiber bands, leading to better durability. VS Tonic has slightly less consistent gauging and minute cosmetic blemishes compared with VS Touch. Otherwise expect the same phenomenal playability and comfort. Thermogut Technology that resists moisture and humidity. The benchmark for tension maintenance and comfort. Extra durability from thicker 15L gauge.

• Length: 40ft. (12m)
• String Tension: Up to 70lbs (32kg)
• Color: Natural