The PowerBlock Sports 9.0 are stage 1 dumbbells that can be expanded in weight to adjust to the current needs of the user. These compact dumbbells are designed to be easier to control and balance and can go from 2kg to 22.5kg, which replaces the need for 16 pairs of standard fixed-weight dumbbells. They feature a patented selector pin system and are equipped with two 1kg 'adder weights' that slot inside the handle for micro-incremental training in steps of 1kg per hand. The dumbbells are supplied as a pair and can be expanded to 41kg per hand using the Stage 2 add on kit.