Designed for 5 to 10-foot putts, the T3 features the same natural arc as thebut is everything you need to learn the stroke and ensure you get the ball starting down your aim line very precisely. Tee holes are included to secure the T3 to the green while you practice. We recommend buying theorfor indoor or outdoor use and using the T3 as a portable model. However, non-skid tape or hook fastener can be applied to the underside to use the T3 indoors. In a practice session, you can putt hundreds of balls from the exact same spot with the exact same setup until you feel like there is nothing you can do other than start the ball rolling toward your target. It’s a huge confidence builder!