Air-foam chamber provides a realistic feel. The rounded design allows for easy movement around the target increasing cardio, leg conditioning & hand-eye coordination. Powercore power transfer ring absorbs impact and reduces base movement and sliding. High-density base can easily be filled with water or sand (approximately 250 lbs. with water, 370 lbs. with sand). Solid base provides easy-to-hit target, maximizing your workout. Height is adjustable from 56 to 65 inches. Not recommended for outside use. Size: 56*56*52cm