Inflatable high frequency welded PVC bladder with nylon reinforcement holds air for cushioning upon impact. Polycanvas fabric shell 400 count denier for durability. EverFlex high tension spring for quick rebounds. High-density plastic base holds up to approximately 65 lbs. of water or 90 lbs. of sand for stability. Assembles to height of approximately 63". Kit includes: Neoprene heavy bag gloves with EverFresh & EverCool technologies; Intense calorie-burning workout DVD with a pro boxing trainer; Foot pump.