When hitting the ball, and it can comfortably form a perfect triangle between the forearms, reducing hand shaking and making the balls more stable. The product is make of rubber to ensuring long lasting wear and provide a stable push rod . Use a connecting ball to train you to moves your center forward and maintain a strong wrist position when hitting the ball. Suitable for golf enthusiasts who want to improve their putting skills, especially for training in indoor environments. Whether beginners or experienced players, this set can meet the needs of different levels.