Set contains 113 micro and classic K'NEX pieces. Create 10 different model ideas including a plane, helicopter, rocket and more! Let your children experience endless building possibilities with this unique building system from K'NEX! Set comes with an easy-to-follow instruction manual. Ideal for kids 5 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 supports the developmental growth of hand-eye coordination, fine motor skills, problem-solving skills, & spatial awareness.