The U-33 Stage I Set has a weight range of 3-21 lbs per hand and will replace 16 pairs of dumbbells or 352 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, and 21lbs per hand.