This is a silicone putter cup included in the putting mat set. It can be used as a target on putting mats or practice greens at golf courses. Since it comes in a set of two, you can use one on your home putting mat and the other in your caddy bag for practice greens on the course. The inner hole size is the same as the cup size on a golf course. Inner diameter: 108cm, Height: 8mm Material: Silicone Brand Name: Danact Thank you for viewing.