Check the listing for details. Self Study Ace Master Aid Tennis Training Equipment Serve Master Improve Tool. Condition: New. Listed at 100.91 USD. Self Study Ace Master Aid Tennis Training Equipment Serve Master Improve ToolThis product data sheet is originally written in English. Self Study Ace Master Tennis Training Equipment Whip Serve Master Essential Tool Size Adult: About 81cm Kids Women About 74cm Product Details Serve Action Keep your arms relaxed and naturally wander around Positive and negative practice Reasonable force, seize the opportunity Action demonstration, left correct Intercepting practice Avoid excessive force Cutting practice With the shoulder as the fulcrum Coach Recommendation Real Pictures Self Study Ace Master Tennis Training Equipment Whip Serve Master Essential Tool Size Adult: About 81cm Kids Women About 74cm Product Details Serve Action Keep your arms relaxed and naturally wander around Positive and negative practice Reasonable force, seize the opportunity Action demonstration, left correct Intercepting practice Avoid excessive force Cutting practice With the shoulder as the fulcrum Coach Recommendation Real Pictures Adult size 81 cm MPN Does Not Apply Brand Unbranded Kids height Under 150 cm Accessory Type Others Feature Improve serve level and accuracy Item Type Training Aids Model Number DP0320 Country/Region of Manufacture China Kids size 74 cm