Specification: Material: Eco-friendly flocked PVC Diameter: about 15 cm / 5.91 inch Color: Black/Gray/Red Product weight: About 40 g Feature: 1. Through the use of PGA veteran players to improve the use of a beginner and professional coach teaching the necessary swing aids, popular in Europe and the United States 2. Scientific and reasonable design and construction, easy to carry, easy to use, inflatable balls can adjust the size of their own, neck rope can adjust the length, suitable for golf enthusiasts of different heights. 3. This inflatable smart ball is connected to an adjustable rope to meet everyone's needs. It is currently on the market a very good training aid that can be used in the armpit, can also be inflated between the forearm. The smart ball helps you understand how the arm and body work during the effective golf swing. Now you control your swing, so that you can have effortless power instead of weak effort. With the help of this golf intelligent inflatable ball trainer, you can correctly grasp the swing position, fix and strengthen the arm distance muscle memory, avoid arm bending, synchronize your body and arm, effectively improve the swing skills to master the correct swing position, find the right impact point. It is a good training tool for golf enthusiasts to improve your swing performance through repeated training of intelligent ball trainers in a short time. Reminder: There are plastic sheets to prevent leakage. When inflating, it is necessary to clamp the air openings and do the same when deflating. Package includes: 1 * Golf Swing Trainer ball + 1 * Air pump