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Build an atomically cool coaster with dueling action with this K'NEX Building Set - Atomic Coaster! Use over 850 K'NEX pieces to create a thrilling roller coaster building experience. 2 dueling cars twist, turn, and dive as they race through over 37 feet of track! The Atomic Coaster builds over 4 feet tall and includes a motorized chain lift. Color-coded, easy-to-follow building instructions are included. Requires 2 "AA" batteries (not included).