The inflatable sandbag is made of high-quality, environmentally friendly PVC, which is durable, Thick bottom design, wear-resistant, easy to inflate and deflate, It can be folded into a small storage space, the rebound speed is fast, but it is soft enough and it is 125cm high when fully inflated. Simply fill the bottom chamber with water or sand to keep the bag upright, then fill the top chamber with air to stay fit. Note that lots of water or sand can make the bag stronger.WIDE USE - This practical and fun kickboxing training pack improves agility and hand-eye coordination and encourages physical activity in children. Perfect for home, garden, gym and more. STRESS AND ANGER RELIEF - This fun inflatable bounce tower is great for exercise and stress relief for kids. Ideal for reducing stress and anger. NOTE: When opening the package, do not use a sharp object to cut it like a knife, to avoid damage.