Wilson's Synthetic Gut Power technology equips this string with a solid nylon core that delivers a smooth feel with exceptional durability. High-energy wrapping around the nylon core helps to increase power with each stroke while maintaining a crisper feel on contact. The 16-gauge construction will improve your racquet's handling and provide explosive bounce-back with the ball. This 40'L nylon string comes in a bright lime green color ensuring your racquet stands out from the competition.