Corrosion Resistance: This sports dumbbell is water resistant, corrosion resistance, durable, not easy to rust after long term use in water, and has a long service life. Safe Material: Aquatic dumbells are made of high quality EVA material, tasteless and waterproof, safe and environmental protection, the resistance of the barbells will provide an overall workout for your upper body, lower back and other parts. Good Elasticity: This floating dumbbell has good elasticity and is the best equipment for water dumbbell exercise without affecting the water quality. Great for aquatic classes, water physical therapy, pool exercise, underwater fitness, and water aerobics Beautiful Appearance: This sports fitness equipment is beautiful in appearance, colorful, excellent workmanship to play in the water. They provide flotation and low water absorption. Lightweight and portable. Lightweight: This yoga dumbbell is lightweight, compact structure and highly buoyant in the water, suitable for strength training. The greater the resistance in the water, the higher calorie burn you'll experience.