These Extra Heavy barbells work wonders in the water for the experienced aquatic aerobics exerciser as well as with athletes wanting a more physical alternate workout. By providing maximum buoyancy and resistance, the Theraquatics XHeavy Water Workout Dumbbell will increase the effectiveness of your upper body workout. Features: Maximum Resistance: 5" thick foam each end of dumbbell, easy to carry and store for everyday use, closed cell EVA foam (won't crack, chip or absorb water), and soft padded grips for extended workouts. The XHeavy Water Workout Dumbbell has a submerged force of roughly 12 lbs (99% resistance). Latex Free. Sold individually.