Tennis Dial Arm Strap Adjustable Training Wrist Band Tennis Swing Correct Exerciser

Feature: 1. Correct the wrong movement of the wrist upper arm hitting the ball. 2. Quick to form correct swing muscle memory. 3. Improve the stability of ball hitting. 4. Dial design to easily adjut and fits your upper arm wrist well. 5. Easily attach to your tennis racket(not included). 6. Fits circumference from 11cm(4.3\ ) to 37cm(14.6\ ). Specification: Features: Correct the wrong movement of the wrist upper arm hitting the ball. Quick to form correct swing muscle memory. Improve the stability of ball hitting. Dial design to easily adjut and fits your upper arm wrist well. Easily attach to your tennis racket(not included). Fits circumference from 11cm(4.3") to 37cm(14.6"). Specification: Material: Polyester + SBR Fits circumference: 11 37 cm 4.3 14.6 in Package size: 12 * 8 * 5 cm 4.7 * 3.1 * 2.0 in Package weight: approx. 47 g 1.7 oz Package List: 1* Training Band Package List: 1* Training Band