The Kid Kick Wavemaster is the perfect size for young martial artists! Each bag features four height adjustments and a rounded base for easy roll relocation. The Kid Kick Wavemaster has the Kid Kick logo screened on the front to allow students a target when practicing kicks and punches. Four height adjustments. Base fills with sand or water and is rounded for easy roll relocation. Weighs approximately 170lbs when filled. Weighs approximately 170lbs when filled. Wavemaster is a registered trademark of Century, LLC. U.S. Patent #5,624,358