The Power Block U90 Stage 2 add on kit is part of the Urethane Series & is designed to replace 28 pairs of dumbbells or 1163kg (2564lbs) of free weights. It requires U90 Stage 1 & is further expandable with the U-90 Stage 3 kit. Together with Stage 1, the kit offers a weight range of 2-41kg (4.4
- 90.4 lbs) per h&.