This slim, portable design allows you to practice anywhere. Do you ever find yourself practicing putting on a crowded golf course, having to be mindful of others? As someone who is shy and introverted, I was hesitant to join others in aiming for the cup. So, I created a tool that allows you to practice putting even in the corner of the practice area. It's a slim, portable design that can also be used at home, making it a win-win. I found it so useful that I'm now selling it. If you're in the same situation, please consider purchasing one! And even if you're not, please do! This tool helps you check if you're hitting the face straight. The opening is approximately 59.5mm wide and 49.5mm high. Balls and tees are not included. The price is for one black practice tool. You can practice slowly at home or in the corner of a crowded putting green on the course. It stands on its own by inserting a tee, making it convenient to carry. However, it may wobble 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. It can be used as a substitute for a cup when laid flat. This is a 3D-printed product, so there may be unique layer lines. Please understand. Item...Putter Practice Tool