Kimony Tennis Accessories Tennis Training Equipment Tennis Flex KST365 The Tennis Flex trains players' instantaneous power and overall body coordination, making it suitable for training that links all body parts. Using the Tennis Flex also allows you to check your swing, and players who tend to use their arms can learn to hit strokes with a focus on their core. Toalson Power Shot Maker *Recommended by Takeshi Murakami Your racket becomes a training tool. Sweet spot, powerful swing - both are good, but a bit much to buy individually... I want to practice easily enough to keep one in my racket bag... In response to such voices, Toalson proposes a new standard! You can actually attach it and play (hit balls). Unused item, but The box is crushed. Please understand. To reduce shipping costs, I will take it out of the box and package it.