Century Kid Kick Wavemaster. A scaled down version of the original Wavemaster, the hollow polyethylene base can be filled with sand or water to keep the bag stationary. The rounded base makes it easy to roll this partner into position. Durable vinyl cover is filled with a high impact foam. Four height adjustments ranging from 37" to 52" allows the bag to grow with the child. Weighs approximately 170 lbs. when filled. Made in the USA.