Giant Roller Ramps Starter SetLittle builders can design and construct their very own giant roller rampswith lots of high action thrills built right in! Children simply snap together the large plastic pieces in any configuration they can imaginethen launch an included plastic ball and watch it twist and turn through the ramps! 17 pieces & 1 plastic ball. Includes a guide with building ideas. The longest ramp piece measures 12\. Young builders require adult assistance.