Description: 2 Pieces high quality Tennis Trainer Balls On String with 2 Pieces Racket Dampeners for self training studying Perfect tennis Ball trainer tools for precision control, skills of tennis, suitable for many places like garden, park, etc Silicone tennis racquet dampener, good shock absorption, not easy to fall off, durable, easy to get on and fits snugly on racquets Practice your tennis skills without picking up the balls frequently Perfect for tennis learner and tennis teaching training Specification: Material: Rubber Diameter : 6.3cm/ 2.48inch Rope Length: Appox.3.8m/12.47feet Rebounce: Appox.7- 8m/22.97-26.25feet Dampeners Material: Silicone Size: Diameter: 0.4inch / 1cm Height: 0.2inch / 0.5cm Color: White Blue Package Includes: 2 Pieces Tennis Trainer Ball on Strings 2 Pieces Racket Dampeners Note: Product color may vary slightly from what appears online due to monitor differences.