Description: The Golf Ball Alignment Marking Tool effectively launches a straight line to fill the hole and provides accurate ball gravity to help keep your club steady and correct. It is a great golfing tool for friends, parents, brothers and family members, and a great gift idea for birthdays, Christmas, family reunions and New Years. Specifications: Product Name: Center of Gravity Marker for Golf Ball Material: Polypropylene Some tips: 1. The capacity of the battery must be sufficient to provide power for high-speed rotation. 2. Press and hold the button and wait for the LED green light to fully light up before using it. 3. In the process of using the pivot point or the center of gravity line, the ball should be hit lightly, because the golf ball rotates at a high speed on the scriber. It's easy to get the thread dirty if you keep pointing at the ball. 4. If the attached marker pen is worn and cannot be used, please use a commercially available oil-based pen (fine tip pen) 5. The quality of the golf ball is not good, and it is easy to jump the ball in the turning groove. Packing list: Golf mark *1pcs