This is a mechanical 3D-puzzle of the trailer for Kirovets K-7M. The trailer is a great addition to the tractor model (AV0523602) , and together make a beautiful work of engineering and intricate assembly. Eco-friendly sustainable material. Very high precision laser-cut plywood with amazing details. All inclusive boxes, self assembly. No messy glue required. Clear colourful step-by-step assembly instructions. Model includes candle wax for gears, sand paper and rubber bands (not all kits, included when relevant). Very sturdy construction.