Practice your boxing or martial arts skills with this person-shaped punching bag. Bob features 7 adjustable height settings that let him stand between 1.5 metres (5 feet) and 2 metres (6 feet, 6 inches). The high-strength plastisol surface covers an impact-absorbent filling of urethane foam. Fill the base with sand or water to give Bob stability; the filled base weighs up to 270 pounds (122.5 kg).