Features: Our combustion engine model is suitable for middle school physics course experiment teaching. Two ways of using, manual or connecting power supply. The Experimental Model sets can be used to explain the basic structure and working principle of a four a stroke single cylinder diesels engine. This diesels engine model is proven and tested for durability and function in real worlds use and conditions. Good quality for durable and long lasting use. The structure and components of the model have been adjusted before leaving the factory, and the actions of each part are unified and coordinated. Compact design, making it convenient for demonstration. Simple and reliable in general applications. If have any questions, please to contact our. Specifications: Material: Plastic Color: As The Picture Shows Package Weight: approx.770g Size: approx.16.7x10.3x29cm/6.57x4.05xin (More Size Detail, Please See Photo.) Package Includes: 1Pc Combustion Engine Model note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!