113 Micro & Classic K'NEX Pieces Create 10 Different Models Ages 5-10 STEAM DevelopmentCreate 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 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.