This is one web you will want to get caught in with the KNEX Thrill Rides 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! This cool set includes over 430 KNEX parts and pieces, including rods, connectors, glow in the dark track and an air propelled coaster car. Ideal for builders aged 9 to 14 years old.