The 36 Orlimar practice balls are made from a lightweight and durable material that allows you to practice indoors or outdoors without having to worry about damaging or breaking anything valuable.?Twenty-four practice balls are made from plastic with vent holes and twelve practice balls are made from high-density foam.?Golfers will definitely increase their performance, and consistency and maximize their swings with these Orlimar practice ballsMade of lightweight high-density foamTwenty-four plastic practice balls with air holes and twelve high-density foam practice ballsIdeal for training indoors and outdoors?