Features: The Speed Ball is great training tool designed to elevates your golf performances. Make from rubber, strong, enduring. Can withstand repeated use. The Speed Ball securely attaches to golf club shaft, enabling customization of swing weights through various positions. Easy to install: 1, insert club into the slot, 2, adjust to the appropriate position, 3, rotate the ball to lock. Installing it in the center of the poles is very suitable for training rhythm. Install it under the grip for teaching strength release and short rod exercises. Install it near club head to obtain the great weighted club. Specifications: Component: Rubber Size: about 9.2x7.0cm/3.62x2.75inch Package Includes: 1pc Golf Strength Trainer note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.