Hang these rings on any bar for instant fun in strength training or play. What makes these rings different from any other on the market is the ease in which they are adjusted. The carabineer clips easily flip open and closed and the straps are color coded to ensure each ring is set for the same height. The rings are made from a strong polycarbonate and the surface has a non-slip texture. Not intended for competition. Rings help with Grip strength from hanging, Swinging, Pull-ups, Leg lifts, Arm Strength and Ab Strengthening.