Babolat's top of the line Natural Gut in a thin, spin responsive 17 gauge. Used by top touring pros and players who demand ultimate feel and control. VS Natural Team Gut is constructed with a tighter gauge tolerance than any previous Babolat VS Natural Gut offering. Includes Thermogut Technology - a process of high temperature finishing that increases the cohesion of the fibers down to the core of the string. Now comes with BT7 technology which is a new layering structure, increasing durability by 15%. Offers a slightly firmer feel, but remains the "Gold Standard" for comfort and playability.