This inflatable boxing column is easy to fill water/sand and inflate air to use. It rebounds quickly and softly, suitable for fitness, stress and Taekwondo training. Features: Made of nvironmental protection PVC material, sturdy and reliable. Easy to install, open the cover in the bottom and fill water/sand into it, cover the stopper closely. Pumping air into inflatable hole until it is totally inflatable is ok. Easy to carry, can be used at anytime anywhere. Inflatable sandbags are perfect for fitness and stress. Improve coordination and flexibility, burn calories and reduce stress while increasing flexibility and hand-eye coordination. It is also an nice choice for Taekwondo training. Can be used for adults and children. Specifications: Material: PVC Boxing Post Diameter: 350mm / 13.78in Item Height: 1600mm / 62.99in Package Weight: 700g / 24.69ounces Package Size: 200 * 200 * 60mm / 7.87* 7.87 * 2.36in Instructions: 1. Open the bottom plug 2. Fill the water inlet with water or sand 3. Close the inner plug and tighten the outer race 4. Inflate through the nozzle with an air pump Remarks: 1 Be sure to hold at least 7 kg of water, otherwise the column will not stand upright and can easily fall over. 2 As this product is plastic inflatable, please keep away from pointed objects to avoid scratching the air leakage. 3 Do not squeeze hard, children should not sit on it to avoid damage due to excessive pressure. 4 When inflating, just use an appropriate amount. Do not over-inflate to avoid blasting. Packing List: 1 * Inflatable Boxing Post (pump not included)