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Lakeshore Gravity-Powered Eco-Tech Bulb Stem Kit$15.99
Kids power up this brilliant bulb with gravity or crank to light up their surroundings! The kit invites children to build a dual-powered generator that transforms gravity or manual power into electrical energy--for tons of STEAM fun! Kit includes 13 pieces, plus a guide--just use your own water bottle and screwdriver! Gearbox measures 6 1/2".