PowerBlocks are the easiest adjustable dumbbells to expand, so as your strength grows, they can too. Designed for a versatile workout, the PowerBlock EXP Stage 2 Kit pairs with the EXP Adjustable Dumbbells. The Stage 2 Kit will let you expand the PowerBlock EXP 70 set and take a 22.5kg (50lbs) set up to 32kgs.