It's a thin, portable design, so you can practice anywhere. It comes with detachable dedicated legs. When I was a beginner, my putts would go back and forth around the hole on the course and weren't stable. I couldn't get a feel for the distance. I wondered why I could almost always make putts on a typical return-function putting practice mat I used at home. So, I used this practice tool on the flat mat section to practice. By not using the slope of the return function, I was able to get a feel for the distance on a flat surface. To improve directional accuracy, I started by placing it close and gradually moved it further away. This made my putting much more stable. Also, there were times when the putting green at the golf course was crowded when I wanted to adjust my distance before a round. I'm a shy person, so I was hesitant to join others and aim for the cup. So, I use the thin gate of this practice tool to practice in the corner of the practice green. By using it this way, my putting has improved quite a bit compared to before. *This is a personal result and does not guarantee the same effect for everyone. Please understand. Recommended for beginners. The opening width is about 59.5mm and the height is about 49.5mm. Balls and tees are not included. This is the price for the gate and two dedicated legs. It is designed to stand on its own by inserting a tee, making it convenient to carry. In that case, it wobbles slightly. *When standing with a tee, it will be slightly tilted, so the opening height will be about 5mm lower, but the ball can still pass through. The dedicated legs are detachable and have some play, but there is no problem with self-standing. You can use the gate alone, lying flat, as a substitute for a cup. Due to being a 3D printed product, it has unique layer lines. Please understand. Item...Putter Practice Tool