Check the listing for details. Professional Tennis Training Tool,Tennis Practice ServeSelf-study Correcter. Condition: New. Listed at 45.00 USD. Professional Tennis Training ToolDescriptionName: Tennis training toolColor: Black, whiteUses: Tennis Training, Tennis PracticeType: Correcter Tennis Wrist Posture(Wrong Wrist Action Diagram) Forehand and backhand batting is the most basic and important technique in tennis. A stable forehand and backhand batting is needed by players of any level. The incorrect use of wrist movements can easily destroy the stability of the forehand and backhand. Man's wrist is very flexible, because its flexibility is naturally thought to be easy to control. In fact, it's not only ineffective to use a weak wrist to control the ball, but also very vulnerable to injury.FeaturesBy correcting the wrong wrist movements, quickly form the muscle memory of the correct shot, improve the pace adjustment ability, improve the stability of the shot, and increase the rotation of the ball. CANCELLATIONFREE CANCELATIONContact usWe can be contacted at any time through eBay messages if you have any questions, comments or product requests. We will respond to you within 24 hours and do our best to help you out! We encourage our customers to contact us with any questions or concerns! We'd like to be sure you are completely satisfied with your purchase SHIPPING: FREE FAST SHIPPING PAYMENT:WE ACCEPT PAYPAL RETURNS:RETURN UP TO 30 DAYS