Size: 13 * 4.5cm. Material: ABS, (Included) Button battery powered, sight setting: the sight head can be rotated, adjust the sight so that the line is 90 degrees perpendicular to the head, and then use the practice putter Lightweight & PortableFits easily to any golf club.Small size and easy to carry. Placing this plastic golf putter on your golf club, you don't feel so much weight on your golf club as it is so lightweight. Consistency: By using a golf training laser pointer regularly, you can develop consistent swing and putting techniques that will help you play better on the course. Instant feedback: Golf training laser pointers provide instant feedback on your swing and putting, allowing you to see the results of each shot immediately. This can help you make adjustments in real-time and improve your technique more quickly. Visualization of swing and putting: The laser pointer can help golfers visualize their swing and putting technique by showing the path of the club or putter. This can help you identify any flaws or errors in your technique and make adjustments as needed.