Working W12 Engine Transmission Model: This engine model kit that works accurately simulates blade rotation and drivetrain operation, showcasing automotive engineering for builders age 14+ Clear View Mechanical Design: Transparent cylinder head reveals detailed internal mechanics including valve system turbocharger and exhaust making this engine model kit for adults both educational and display worthy Mechanical Engineering Project: The 871 piece engine model kit that runs develops technical skills through assembly while producing authentic engine Complete Building Package: Includes color-coded manuals in protective packaging, assembled model measures 22.5×25.4×13.2cm (8.9×10.0×5.2in) Premium Automotive Build: This mould king engine compatible transmission set delivers precise mechanical movement for car enthusiasts Mould King W12 Engine Toys Building Block, Model Engine Kit for Adults, V8 Engine Scale Model, 10230 STEM DIY Building Kits That Works, Blocks for Adults and Aged 14+ (871 Pieces)