Provides excellent resistance and rapid rebound from punches. Strong enough to take kicks. New! Wavemaster III Base: Wider for Extra Stability. Easy To Fill, Easy to Reach Cap. Twice as Many Height Adjustment Options - Was Four Now Eight. . High impact foam striking surface, with a durable vinyl cover. Eight height adjustments allows the bag to stand 52inches to 70inches tall. Base fills with approximately 270lbs. of sand or water to keep stabilized. Base is rounded for easy roll-away. Makes a great bag where space is at a premium.