Exquisite Mechanical Decoration: The ingeniously designed mini OHV inline four-cylinder diesel model, with premium quality & extremely textured metal parts, briefs you on the wonderful world of mechanical engineering in an immersive environment. All Included For Building This Engine Model: The engine consists of 300+pcs parts and comes with a paper English instruction manual. You will personally experience the whole process of assembling from small parts to the finished product and build a shocking engine model. Superb STEM Activity: The wonderful activity allows adults to cooperate with children for assembly to spend their leisure time, which enhances parent-child interaction, walks children through popular industrial knowledge, increases their knowledge and imagination, develops mental and logical thinking as well as improves innovation and creativity. Special Gifts: This engine will make great industrial technology in the form of inheritance in the hands of every owner. Packed in a high-end gift box, the product makes a perfect gift for children or adults that is irresistible and satisfying. Applicable age:14+