Features: ?Build 20 different models including a dragon, mouse with cheese, mermaid and more. ?Comes in a treasure chest 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. ?K'NEX supports the developmental growth of hand-eye coordination, fine motor skills, problem-solving skills, & spatial awareness. ?K'NEX rods and connectors are responsibly made in America at a landfill-free, zero-waste green manufacturing facility in Hatfield, Pennsylvania. ?Set contains 353 K'NEX pieces to build 20 unique models. Suitable for ages 5 & up