This inflatable boxing column is easy to fill with water/sand and inflate the air to use. It bounces quickly and softly, suitable for fitness training, stress and Taekwondo. Functions: Made of environmentally resistant PVC material, durable and reliable. Easy to install, open the lid at the bottom and pour water/sand into it, cover the stopper thoroughly. Pumping air into the inflatable hole until it is fully inflated is fine. Easy to carry, can be used anywhere, anytime. Inflatable sandbags are ideal for fitness and stress. Improve coordination and flexibility, burn calories and reduce stress while increasing flexibility and hand-eye coordination. It is also a good choice for Taekwondo workouts. Can be used for adults and children Technical data: Material: pvc Boxing Post Diameter: 350 mm / 13,78 inch Item Height: 1600 mm / 62,99 inch Package Weight: 700g/24,69oz Instructions: 1. Open the bottom plug 2. Fill the water inlet with water or sand 3. Close the inner stopper and tighten the outer treadmill 4. Inflate through the nozzle with an air pump air 1 Be sure to hold at least 7 kg of water, otherwise the column will not stand upright and can easily tip over. 2 Since this product is inflatable plastic, please keep it away from pointed objects to avoid scratching the air leakage. 3 Do not squeeze hard, children should not sit on it to avoid damage caused by excessive pressure. 4 When pumping, just use the right amount. Do not inflate excessively to avoid explosion. List of things to pack: 1 * inflatable boxing post (pump not included)