It's a round water bag. The capacity is MAX 20kg. Comes with a pump and storage bag. - Strengthen Core Muscles: The spherical water bag utilizes the unstable weight of water, allowing you to focus on your core more than with regular training. It effectively trains both outer and inner muscles. You can easily strengthen your core and balance at home without going to the gym. - Improve Physical Strength: You can expect to increase muscle strength through the unstable water support. Enhanced muscle strength improves metabolism, improves posture, and assists with weight management. It uses durable and environmentally friendly materials, so there's no need to worry about leaks. Made of sturdy and soft high-strength nylon, it's easy to grip and won't hurt your hands. - Versatile Use: Convenient for continuous long-term training. Suitable for a wide range of training levels, from beginners to professionals. Comes with a dedicated wrench for easy water filling and draining. - Simple Design: You can start training immediately with just water and air. When not in use, you can drain the water and air and fold it compactly for storage, so you don't have to worry about storage space, and it's also convenient to carry. #WaterBag #Dumbbell