Water Gear Ther-A-Float Rings, Large (Blue) - Water Gear Ther-A-Float Ring is sold in pairs which allows you to wear a ring on each arm. You can also get another pair so you can wear them on your ankles or legs so you can float vertically! Some people with arthritis also use these pool floaties arm rings to get some mild exercises without stressing joints and muscles in the deep water. This swim flotation aid and exercise equipment is made of high quality non- toxic closed cell EVA foam to ensure it is durable and safe to use. Our exercise ring floaties are lightweight so you can conveniently bring them to your aqua therapy, aquatic aerobic exercise or swimming lessons. The Large (Blue) float rings have the following dimensions: Outer diameter of 12 inches, 3-inches thick, a have 5-inch diameter opening.