With BOSU trainers, the all-steel cart and official BOSU instructional materials, these ClassPlus Packs include everything you need to get started with BOSU today. The all-steel UltraFit cart is much sturdier than other BOSU carts, and since each trainer sits on its own ‘shelf’ (instead of stacked on top of one another), a whole class of users can take out and put back their trainers all at once. Each pack includes BOSU NexGen, NexGen Pro, or Elite trainers, UltraFit BOSU Storage Cart(s), and 1 BOSU Complete Workout System instructional set. Storage cart also sold separately.