Specifications: Color: Black Diameter: 35*7cm Package weight: 32g/pc Features: Package contents: The package contains 1 piece of golf arm band trainer,the color is black, size is 35*7cm. How it work: The comfortable tool keeps your arms close to your body for the best swing possible.Keep your arms and body in sync. Premium Material: The golf swing arm band is made of high-quality elastic plant fabric, which is elastic, stretchable, not easy to deform, and can be used repeatedly.Fitting for most people's arms. Improve swing posture: Using suitable arm trainer bands to assist in training can help improve golf swing posture. Your muscles may maintain training memory. In the next training session, you can use muscle memory to swing more skillfully and make your posture more perfect. Correct the angle of arm force: Practical arm band can help you maintain the correct angle of your arms and body, making the swing more smoothly.