Build a massive, moving, motorized roller coaster toys for hours of exhilarating fun!The K'NEX Web Weaver Roller Coaster Building. This set contains more than 430 pieces, including gears, variously sized connectors, and multiple styles of rods-short, long, straight, and curved-for creating a gigantic coaster that will make your child want to spend more hours in playtime. The rods and connectors can be attached easily to create a coaster that stands 2.5 feet high.The air-propelled coaster is equipped with a battery-powered motor that lets the car travel at high speed and through vertical and horizontal thrills. For the ultimate in fun, let your child flip the coaster while the car is traveling through the tracks and witness the amazing performance of the air propelled car!The K'NEX Web Weaver Building Set has step-by-step color-coded instructions to walk you and your child through the process of building a gigantic coaster that your child will want to start experimenting with immediately. Age: 9+ yrs.