PowerBlocks are the easiest adjustable dumbbells to expand, so as your strength increases, so can they. With this set, you can increase the weight of your PowerBlock® Sport EXP set 5-50 (22.7 kg) to 5-70 (31.7 kg).
The expandable Sport model starts at 22.7 kg (5-50) and then gives you the option to expand with two 9 kg (20 lb) kits. The 'Stage 2 Kit' takes a set from 22.7 kg (50 pounds) to 31.7 kg (70 pounds), while a 'Stage 3 Kit' can increase a set from 31.7 kg (70 pounds) to 40.8 kg (90 pounds).
Note: this is an expansion. This set can only be used together with PowerBlock® Sport EXP set 5-50 (stage 1).
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