Superior Quality and Durable: The inflatable punching bag is made of high quality environmentally friendly PVC, durable, with thick bottom, wear-resistant, easy to inflate and deflate, can be folded into small size for storage, with speed of Quick but fairly soft bounce, it measures 125cm in height when fully inflated. . Usage: Simply fill the lower chamber with water or sand to keep the bag upright, then fill the upper chamber with air and ready for fitness. Note that enough water or sand can make the bag more firmly. . Widely Used This useful and fun training bag helps increase agility and hand/eye coordination and promote physical exercise in children. Suitable for families, classes, gyms, etc. . RELIEVES STRESS AND ANGRY: This fun inflatable punching tower is great for keeping fit or to use as a stress reliever and can be used by kids. Excellent for relieving stress and anger. Note: When unpacking, please do not use a sharp object such as a knife to cut it to avoid damage. .