Buy Strength Equipment Advantage: High-quality PVC material for long-lasting durability. Transparent color and graduation let you know how much water filled. Max. bearing: 25kg / 15kg. Fill water and air inside the bag to increase instability and train your muscles and balance. 4 soft handles ensure firm grip and allow for variety in your exercises. Comes with an air pump to fill air and inflate the bag. Parameter: Item size20*85cm/26*85cm Packing size41.5*19*12cm/87*54*39.5cm NW/GW13.50kgs ColorWhite MaterialPVC FunctionMix water and air into the bag body, use the weight of water and the instability of the flow, not only to exercise the commonly used muscles, but also to train more nearby muscle groupsBuy Strength Equipment website:http://www.beautyjiang.com/strength-equipment/