Uzala Boxing Heavy Bag , is a polyurethane/PU leather hollow sandbag. There are four different sizes, 60cm/80cm/100cm/120cm. It has a reforceed design improve with load bearing for safety. The sandbag is empty and can hold rags, sand, beans and other things. After punching and kicking, the sandbag absorbs and reduces vibration, thereby protecting the bones. The healthy benefits are increase in physical strength, and muscles power. Improve responsiveness, enhence nerve judgment, physical fitness and coordination.