3 years & up. Solve the puzzle build a truck! This exciting STEM vehicle building set features interchangeable truck parts that little ones can mix and match to build 4 different functioning 3D truck models. Just stack the parts correctly to reveal a Fire Truck, Dump Truck, Cargo Truck, and Tipper Truck with wheels that actually roll. Helps children develop their problem solving and fine motor skills. Pieces are the perfect size for little hands. Parts are interchangeable with other Luke's Toy Factory toy trucks. Made in the USA from sawdust and non-toxic plastic. Sink washable. Each assembled truck measures approximately 6"L x 3"W x 4"H. Includes: 22 Truck parts that make up 4 different 3D truck models with working wheels.