This lot of K'NEX pieces includes over 32 pounds of assorted parts, featuring a variety of wheels, tires, and manuals. The set is compatible with the K'NEX Builder Set and is perfect for children ages 9 and up. The pieces are made of durable plastic and come in a multicolor design. This bulk lot of K'NEX pieces is a great addition to any building toy collection and provides endless hours of creative building opportunities. Whether you're a K'NEX enthusiast or just starting out, this lot is sure to provide hours of fun and imaginative play.