The 16 Pack PGA Tee-Up Multi Color Targets replicate the diameter of a golf hole. The material on the top allows the ball to stick to it displaying accuracy to your game. This item is compatible with the PGA Tour Tee-Up golf balls. It is versatile and easy to practice or for fun. Safe for indoor or outdoor play and there is no assembly required. Proceeds from every Golf Gen purchase benefit The First Tee, a nonprofit organization teaching kids and teens how to play golf.