Features: Multifuntional use adjustable water dumbbells features 2500ml/5lbs to 500ml/1lb capacity, combining hydrations and resistance training for effective pool workouts and aquatic therapy. Builting with PETG+PP materials and slip resistant handle, this leak proof equipment includes 9cm wide mouths for rapid refills and 50% improved sealing performances. Ideal for fitness enthusiasts, aquatic therapy patients, and outdoor athletes seek exercise gear for strength building and hydrations management. Perfect for poolside, rehabilitation exercises, or outdoor group training where water resistance and quick hydrations access. Five color option complement active lifestyle while maintaining structural integrity in 0-40°C environment for performances. Specifications: Component: PETG+PP Color: Blue/Gray/Pink/Orangeness/Cyan Capacity: 500ml/1500ml/2500ml 2500ml Size: Approx. 13.39x5.51inch(34x14cm) 1500ml Size: Approx. 10.83x6.89inch(27.5x17.5cm) 500ml Size: Approx. 9.25x3.15inch(23.5x8cm) Package Includes: 1PC Fitness dumbbells Cup note: Cannot hold hot water. Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.