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"PowerBlock U33 Stage 2 Add On Kit (Urethane Series) The U33 Stage 2 Add on Kit Requires the Stage 1 DumbbellsThe U-33 Stage II add on kit has a weight range of 1-15 kgs per hand and will replace 25 pairs of dumbbells or 393 kgs of free weights.Increments achieved with the U-33 Stage II add on kit are; 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 11, 12, 13, 14 and 15 kgs per hand.Dimensions are; 13.25" L x 5.5" H x 5.5" W. Warranty: PowerBlocks come with a 15 Year warranty for home use. The Urethane Series also comes with a 5 Year Commercial use warranty. ABOUT THE URETHANE SERIES: The Flex Series Urethane Sets from PowerBlock are the fourth generation of PowerBlocks.The Urethane coated weight plates offer the ultimate in smooth, quiet performance in both the weight plates and the selector pins making for the most durable PowerBlock ever. The steel side colored rails are powder coat painted and are on both sides of each block."