Feature: 1. Wheel Shape Design: The golf putter practice ball adopts the appearance design similar to the wheel, which can better help you see the ball line and improve your skills. 2. Adjustable: The golf putting practice ball is equipped with a hand key to adjust and control the weight of the exercise ball, and the operation is simple and convenient. 3. Easy to Use: Put the putting training golf ball on the horizontal putter blanket or green, use the putter to hit the ball, and observe the trajectory of the ball. 4. Portable: The golf putting practice ball is small in size and light in weight, which can be placed in your pocket or bag at will and is very convenient to carry. 5. A Perfect Gift: This golf putting training aid ball is a perfect gift for golf enthusiasts or novices, which can be used to warmming up or help with training. Specification: Item Type: Putter wheel golf ball Material: Plastic, stainless steel Weight: Approx. 91g/3.2oz Size: Diameter: 4.2cm/1.7in. Package List: 1 x Putter Wheel Golf Ball1 x Hex Lock Key