Features: 5 x BOSU Ballast Balls, 1 DVD & 1 Pump Experience the next generation of ball training with the BOSUBallast Ball. By adding a multidirectional load BOSUhave created a weighted (2.5kg approx.) stability ball that incorporates audible, visual and kinaesthetic references to make total body training more versatile, more effective and fun. The BOSU Ballast Ball can be inflated from 55cm to 65cm. Maximum usage weight of 600kg. This ball has a burst resistance rating of 125kg, this means if punctured it will deflate slowly when loaded up to 125kg.