This K'NEX Builder Set comes with a yellow box and a mixed lot of pieces for endless building possibilities. The pieces are compatible with other K'NEX sets and are made of durable plastic material. The set is suitable for children aged 2 and up, and it includes a variety of pieces to spark their creativity. This K'NEX set is perfect for children who enjoy building and creating, and it provides hours of fun and entertainment. Ships from smoke free, pet free home.