To thrill-seekers and model aficionados, these kits are the pinnacle of fun. Each comes with LEGO-compatible building blocks and complete instructions on how to build functional roller coasters. Choose the 900-pc./48.-long Cyclone, 900-pc./38.-long Sidewinder, 500-pc./28"long Flyer, or 332-pc./19.-long Little Dipper. Also available: a 100rpm automatic motor with 6-volt power supply to drive the lift hill. Ages 10+.