from the manufacturer
everlast energy core bag (ea)
air-foam chamber gives realistic experience. Rounded layout allows for smooth motion around goal increasing aerobic, leg conditioning & hand-eye coordination. Powercore electricity transfer ring absorbs impact and decreases base movement and sliding. High density base can easily be full of water or sand (approximately 250 lbs. With water, 370 lbs. With sand). Solid base presents easy-to-hit goal, maximizing your exercise. Top is adjustable from fifty four” to 65″. Now not recommended for outside use.