Cheatwell Games ULTIMATE Techno Balls 920 with Twin Rails, Twin Drives, Double Tower, Double Track DOUBLE THE FUN. Just build the towers, attach the feet, mount the motors, fix the cogs, link the chains, wind the track, clamp the springs, tune the runners, add some balls, switch on and away it goes! A fun, motorised marble chain lift building set containing 920 pieces, including 2 motor driven marble chain lifts and detailed step-by-step instructions. Measuring 580mm tall x 900mm wide x 220mm deep when built - it's HUGE! Hours of perpetual motion, power driven fun Suitable for ages 8+ Requires 4xAA batteries not supplied.