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 powerImprove 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 trainingPremium Material: The The tennis serve master tool is made of silicone material, with high flexibility, easy to handle and use, ensuring durability and longevityPackage 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.