Ensure your comfort when you play with the Wilson Synthetic Gut Power 16 tennis racket string Reel in Black, a solid nylon core with high energy wrap that provides great allaround playability. The Wilson Synthetic Gut Power 16 Set combines an easy learning curve with economic pricing, making it ideal for beginners. Its solid core is tough and holds tension well, with the surrounding wrap generating a powerful response and ensuring durability. Gauge 161.30mm Length 656ft200m Composition Synthetic gut. Synthetic Gut Power utilizes a solid core nylon string for crisp feel and control. High energy wraps increase responsiveness for more power and improved feel on contact. No matter your playing style, this string is easy on the arm and can help you get to the next level. This 16 gauge string is slightly thicker than the 17 gauge, making it more durable.