This is one web you'll want to get caught in with the Web Weaver Roller Coaster Building Set! Use the included parts and pieces to send the air propelled coaster car through horizontal and vertical thrills. Once done building turn off the lights - this coaster glows-in-the-dark! Set includes over 430 K'NEX parts and pieces, including rods, connectors, glow-in-the dark track and an air propelled coaster car. Additionally, builders can head to knex.com to download instructions for a second roller coaster model. Recommended for builders ages 9+.