The Power Block U90 Stage 2 add on kit A requires Stage 1 & replaces 22 pairs of dumbbells or 715.9kg (1578.3lbs) of free weights. Together with Stage 1, the kit offers a weight range of 2-32kg (4.4
- 70.5lbs) per hand & is further expandable with the U-90 Stage 2B kit & the U-90 Stage 3 kit.