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"Build the K'NEX Cobra's Curse, the all-new thrill ride building set that combines motorized roller coaster excitement with exhilarating head-to-head racing. This set includes over 1,100 pieces, including colorful K'NEX parts, a motor, 2 coaster cars and over 32 feet of track. Follow the color-coded instructions to build this exciting dueling roller coaster over 3.5 feet high. Then switch the motor on to bring the model to life. The motorized chain lift quickly carries opposing cars on separate tracks to the top. As they crest the peak, both cars accelerate through opposing tracks that are full of twists, turns and loops in a race to the finish. Instructions for a second dynamic model is available online. Cobra's Curse Dueling Coaster is appropriate for builders and roller coaster enthusiasts ages 9 & up. Requires 2 ""AA"" batteries."