The flex series urethane PowerBlocks have urethane coated weight plates for smooth and quiet performance. The flexi technology in the weight plates and the selector pins make this the most durable PowerBlock. Urethane Series products have a lifetime home warranty. The U90 base set goes from 5 to 50 lbs. and is expandable with kits up to 125 lbs. PowerBlocks cost a fraction of traditional dumbbells.
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