The PowerBlock U-33 Stage II Kit will expand the U-33 Stage I Set from 3-21 lbs per hand to 3-33 lbs per hand. The U-33 Set will then replace 25 pairs of dumbbells, or 866 lbs of free weights. Increments achieved with the U-33 Stage II Set are; 1, 3, 4, 5, 7, 8, 9, 11, 12, 13, 15, 16, 17, 19, 20, 21, 23 ,24, 25, 27, 28, 29, 31, 32 and 33 lbs per hand. The dimensions of U-33 Stage II Kit are; 13.25" L x 5.5" W x 5.5" H. Ships in 2 boxes.

The Flex Series Urethane Sets from PowerBlock are the fourth generation of PowerBlocks. The Urethane coated weight plates offer the ultimate in smooth, quiet performance in addition to Flex technology (patent pending) in both the weight plates and the selector pins making for the most durable PowerBlock ever. The steel side colored rails are powder coat painted and are on both sides of each block.