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Adjustable ball speed
Height: 4 heights that can be adjusted as needed: 15cm/22cm/28cm/36cm
by hitting it and/or using it in a way other than the normal load that occurs during tennis training
you really need to learn to use all the height you can create and hit as high up as you can to get the best possible smash
gripfixer hogerhant medium Wilson Revolve Spin Adjustable ball speedIMMEDIATE IMPROVEMENT With the new GripFixer innovation, you can't go wrong. The tool makes sure your hand doesn't slip and get stuck. The result is immediate! Correct grip is essential. It all starts with a correct grip but it's difficult, takes time and is frustrating to learn. It's a good idea to lay the groundwork by learning the correct grip from the start. But don't forget that you can also correct an incorrect grip, it's never too late!