This is a line marker for golf balls. Set it on the ball and write. Made of plastic, it is lightweight and durable. Balls are not included. You can draw straight lines on the ball, allowing you to align the ball straight to your target for both putts and tee shots. You'll feel more confident with your lines, allowing you to focus on your stroke and hit the ball straight in the direction you aim, contributing to score improvement ᕦ(ò_óˇ)ᕤ I also have many other golf goods for sale. If you leave a comment, I can offer a discount and list them as a set, so please take a look (^_^*) 〓Product List〓 #kuu-shop Golf golf putter putting 1 putt stroke competition golf ball