Increase the usage, intensity and versatility of your BOSU balance trainers ( Elite, PRO, Orignal and Home versions) with the BOSU PowerStax.. Each PowerStax elevates the BOSU by 4 inches and stabilizes in a platform up or down postion. The PowerStax can be used alone and can be filled with 2 lbs to 30 lbs of water for use in weight training exercises. It features 2 sets of handles for varible grip options. Each unit weighs 5 lbs (empty) and measures 4" in height and 27" in diameter. Can be used alone or stacked with other PowerStax for a higher platform. This version is a set of three without a DVD. BOSU are sold seperately. Note, the PowerStax will Not work with any of the smaller BOSU Sports.