Century Bob Body Opponent bag is Ideal for self-defense, boxing or martial arts workouts, the Body Opponent Bag is a realistic training partner. This life like mannequin has a covering made of durable, high-strength Plastisol and an inner cavity packed with tough urethane foam. The height can be adjusted in 6″ increments from 60 to 78″. Fill the adjustable Wavemaster base with water or sand (not included); the unit weighs approximately 270 lbs. when filled.