Designed as an expansion for the PowerBlock Pro EXP adjustable dumbbells, the EXP Stage 2 add on kit provides more versatility with added weights to making your training more efficient and challenging. The expansion provides additional 50 to 70lbs per hand, making it sufficient for heavy duty workouts and building a much more refined physique and mass. It replaces up to 22 pairs of dumbbells or additional 750lbs of free weights. This adjustable dumbbell set expansion offers the same quality and functionality as the basic set, it is supplied as a pair and it can be furtherly expanded with the PowerBlocks Stage 3 EXP set.