Tennis racquet weight adding device can accelerate the formation of muscle memory during swing, and make your muscles strong When you finish your workout and remove the tennis racket swing weight practice training tool, you'll get faster swing speed and stability Make of Zincs Alloys and Coppers Plating, and easy to use, can screwed on the tennis racket both sides Increase the weight of the racket, correct the motion, and increase the hitting force and stability The weight trainer warms up before practice or competition, which used to exercise arm strength and swing