The U-90 Stage II Kit will expand the U-90 Stage I Set from 50 lbs per hand to 90 lbs per hand. The U-90 Set will then replace 28 pairs of dumbbells, or 2565 lbs of free weights. Increments achieved with the U-90 Set are; 2.5, 5, 7.5, 10,15, 17.5, 20, 25, 27.5, 30, 35, 37.5, 40, 45, 47.5 ,50, 55, 57.5, 60, 65, 67.5, 70, 75, 77.5, 80, 85, 87.5 and 90 lbs per hand.