Click the button below to add the Gears & Racks Set * to your wish list.
CLOSEOUT SALE! NOW $3.50 (WAS $6.95) WHILE SUPPLIES LAST
Precise operation/control. Includes 8 gears (7.7mm - 46mm dia.) and two 125mm interlocking racks. Works with other gears marked *.
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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®.|