◆ Thank you for viewing! We will handle initial defects if any. ◆ Shipping to Hokkaido, Okinawa, and remote islands requires an additional postage fee. Please comment in the comment section if applicable. ◆ Product Description ◼️ Core training with the popular water bag! Seriously build muscle and improve balance at home! Efficiently stimulate the entire body's inner muscles with "water training" that utilizes the irregular movement of water. ◼️ The water that sways with every movement puts a load on the core, and you can train balance, concentration, and posture all at once. ◼️ Water volume can be adjusted freely. With a scale, you can easily find the weight that suits you, making it a recommended training item for beginners to advanced users, children, and women. ◼️ After use, simply drain the water and air and fold it up. It takes up little space and is easy to store. It's slimmer than dumbbells and barbells, and easy to carry. Easily inflate with the included foot pump with a dedicated nozzle, and enjoy changing the water color with the included 3-color dye. Accessories Color dye with preservative (3 colors) Foot pump Material Bag body: PVC (polyvinyl chloride) Handle: Nylon