Set comes with 8550 classic K'NEX pieces to build your very own coaster. Set includes a battery-powered motor that gives life to the K'NEX pieces. Requires 2 "AA" batteries, not included. Set comes with an easy-to-follow instruction manual. Ideal for kids 9 and up. STEAMagination - It's the connection of STEAM (science, technology, engineering, arts, & math) with a child's curiosity and creativity. It powers the fun of each K'NEX set. K'NEX Thrill Rides allows each child to build bigger models that move to create an amusement park right in their home! Packaging may vary.