Features: ?Set includes a battery-powered motor that gives life to the K'NEX pieces. ?Comes in a suitacase style package to store all K'NEX parts, or partially and fully built models. ?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. ?Set contains 529 K'NEX parts to build 50 unique models. ?Set comes with an easy-to-follow instruction manual. 7+