Feature: 1. Long Length: Our string reel has about 200m/218.7yd long wire, can be applied for 16‑19 rackets, enough for long term use, improving your using experience. 2. Single Fiber Type: Uses super soft single fiber which can provide high explosive power while protecting the arm well. The surface is fluted for excellent ball control and feel. 3. Special Design: Outer layer has double ribbed design, so that the string can hold the ball without slipping, thin wire can be perfect for the force used in tennis, can enhance the spinning, suitable for playing topspin. 4. High Performance: Due to the strong tensile resistance, the weight loss is very small, able to keep your racket stay in a good state for using, improving your performance. 5. Practical Tool: The ridged design increases the contact time between the ball and the racquet surface, so it reduces the vibration of the racquet surface, also has strong resistance to play. Specification: Item Type: Tennis String Material: Polyester Application: for Amateur, Daily Training Specification: 200m/218.7yd Per Reel Wire Diameter: Approx.1.25mm/0.049in, 17 Gauge. Package List: 1 x Tennis Racket String