Power Systems BOSU Storage Rack with Locking Casters, Holds 14 BOSU in 2 Vertical Stacks, Gray (70290) Stores up to 14 BOSU balance trainers Fits through standard doors Racks feature locking casters Constructed of durable welded steel Rack only, BOSU not included Store up to 14 fully,inflated BOSU&#174; Balance Trainers Constructed of durable steel and heavy duty, non,marking casters &nbsp;Fits through a standard size door Store up to 14 fully,inflated BOSU&#174; Balance Trainers Constructed of durable steel and heavy duty, non,marking casters &nbsp;Fits through a standard size door