Meccano Erector, 4x4 Off-Road Truck 25 Model Building Set, 443 Pieces, for Ages 9 and up, STEM Construction Education Toy 25 BUILDING MODELS - Let your child build 1 of 25 different vehicle models (models can be built one at a time), with 443 parts, real tools and instructions. Kids can mix and match pieces to come up with their own original design for open-ended fun. REAL WORKING VEHICLE - Models include motorized 4WD drive, rotating offroad wheels and opening doors. STEM TOY: For over a hundred years, Meccano has been promoting children's STEM (Science, Technology, Engineering, and Math) learning as they build and play . The Meccano 25 Model Set is for ages 8+ and requires 4 AA batteries (not included).