The Flex Series Urethane Sets from PowerBlock are the fourth generation of PowerBlocks.
Flex technology (patent pending) in both the weight plates and the selector pins making for the most durable PowerBlock ever.
Urethane Series products carry a lifetime home warranty.
Expandable later to 90 lbs per hand with the U-90 Stage II Kit, and again to 125 lbs per hand with the U-90 Stage III Kit.
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