Enhance Hitting Power: The tennis serve master tool is designed uniquely to provide extra resistance when hitting the ball. This helps players exert more force, gradually increasing their hitting power Improve Accuracy: Training with this tennis training tool requires players to focus more on the point and angle of the ball, which aids in improving accuracy and control over their hits. Versatile Use: Apart from basic hitting training, the tennis practice tool can also be used for strength training of arms, wrists, and shoulders as well as flexibility training Premium Material: The The tennis serve master tool is made of silicone material, with high flexibility, easy to handle and use, ensuring durability and longevity Package Includes: Each package comes with 1 tennis practice tool. Also a great gift choice for families and friends on birthdays, holidays, festivals, etc Specification: Material: Silicone Size Chart:1 Ball: 58 cm/22.83 inch Package Includes: 1 Tennis Training Tool Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.