1、The use of this water-filled dumbbell is special and practical, and the weight can be adjusted because the volume of water is controllable, depending on your needs. 2、Weight bag using fine quality PVC material, with nice sealing, no leakage, practical. And because it\u0027s soft, you won\u0027t hurt the floor when you drop it to the ground. 3、The detachable design is convenient for assembly and use, and is convenient for air bleeding to be carried or stored. It is equipped with the necessary accessories. 4、The set of Exercise equipment can help you build fine physical, portable, and space-saving, and can be placed at home or in the office for personal training. It's light, small and portable when it's not filled with water, and when it's filled with water, it has weight, which is nice for exercising arm muscles. Features: The use of this water-filled dumbbell is special and practical, and the weight can be adjusted because the volume of water is controllable, depending on your needs. Weight bag using fine quality PVC material, with nice sealing, no leakage, practical. And because it's soft, you won't hurt the floor when you drop it to the ground. The detachable design is convenient for assembly and use, and is convenient for air bleeding to be carried or stored. It is equipped with the necessary accessories. The set of Exercise equipment can help you build fine physical, portable, and space-saving, and can be placed at home or in the office for personal training. Specifications: Color: blue, black Material: PVC Package size: 250 * 120 * 110mm / 9.8 * 4.7 * 4.3in Package weight: 1077g / 2.4lb Note: Aim the faucets at the mouth of the ball. In addition, our detail page also has detailed water filling method. The finest way is to remove the showers heads and fill the ball with water. Packing List: 8 * Dumbbell Bag (without water) 8 * Screw 2 * Leverage 4 * Extension Rod 8 * Dumbbell Bag (without water) 8 * Screw 2 * Leverage 4 * Extension Rod