EVA foam construction: Made of density EVA foam for a comfortable, non slip grip that is gentle on the skin and light enough for extended use in the pool or lake. Effective water resistance: The design creates natural water resistance with every movement, helping to tone muscles and burn more calories than traditional land exercises while reducing joint stress for a safer, more efficient workout. Versatile fitness tool: Ideal for water aerobics, rehabilitation exercises, and swimming lessons. Targets upper body, core, and lower body through a variety of movements that leverage water's resistance properties. Portable and buoyant: Each dumbbell weighs approximately 130 g (300 g total set) and measures 10.8 x 6 x 6 inches, making them easy to transport to any aquatic facility while providing just the right buoyancy for vertical suspension exercises in deeper water. Use scenarios: In a water aerobics class to build strength and endurance with low impact on joints. During rehabilitation or recovery routines to safely perform resistance training in shallow or deep water. When teaching swimming lessons or practicing buoyancy and technique in deep water, using vertical suspension exercises for core and upper body engagement.