THE REACTION SPEED: big water , water due to gravity or hit the wall or arc to hit the to the opponents straight punch and swing punch attack, it is a good helper to practice . PORTABLE: Compact and lightweight, you can exercise when empty. Just find the water and sand filling, the heavier, heavier, and more stable it is. COMFORTABLE FEEL: Water feels much more comfortable than sandbags, so you dont have to worry about hand injuries, and it can alleviate your negative emotions throughout the day. CHILD-FRIENDLY: A sandbag that promotes childrens sports while helping to agility and hand-eye coordination. Colour: red Material: PVC Size: Diameter: 22cm Package Contents: 1 * Heavy Bag 1 * Water Injector 1 * 1 * Sling Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.