The golf training inflatable ball will help you understand how your arms and body work during an effective golf swing, so as to effectively control your swing posture. Features: Made of high quality polyester and PVC materials, it's comfortable and durable. With an adjustable armverband, the strap can be adjusted to the position that suits you best, and finally clip the ball between your forearms to maintain your posture. It can be used to correctly grasp the swing position, to cultivate good swing habits and effectively improve the swing skills, so as to continue to swing accurately. The golf training ball is easy to carry and doesn't take up too much space. It's perfect for beginners to practice, also suitable for professionals to teach and improve the swing performance, can also be used as a gift for golfers. Specifications: Material: Polyester, PVC Color: Black Ball Diameter: 15 cm(Approx.) Armverband Size(LxW): 40 x 10 cm(Approx.) Package Contents: 1 x Inflatable Ball 1 x Armverband Please note: Due to manual measurement, there might be a tolerance in the product size. Due to the lighting effects and shooting angles, the color of the item and that shown in the picture might have a nuance.