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Bulk Pack of 20 sets of four pulleys: 10mm diameter with a 2mm hole; 20mm diameter with a 1/8" hole; 30mm diameter with a 1/8" hole; 40mm diameter with a 1/8" hole.
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All prices are in USD. Registered Trademarks of KELVIN L.P include, but are not limited to: KELVIN®, Hands-On Science®, Build A Better Mousetrap Racer®, Rat Racer®, And the Winner Is…®, New Standards®, and SUMO Car Wrestler®.|