Features: The birth of a 100% brand new high-quality four-cylinder engine. In 1894, Maybach and Paul Daimler completed the development and design of an inline four-cylinder engine. The cylinder adopts casting process and adopts Maybach's patented carburetor technology just obtained in 1893. At the end of the 19th century, this Maybach in-line four-cylinder engine was indispensable for almost all the best cars in the world. Professional grinding and polishing perfectly interprets the vision of the era of creating human wisdom and the yearning for large industries: the mechanical structure is presented to the extreme, the transmission process is clear at a glance, and the beauty of logic and power is fully displayed. Reduction degree: Based on historical classic inventions and products, it intuitively demonstrates the core principles of the machine and the core value of the machine. The product design is inspired by human industrial technology. The color is shown in the figure. Material: Resin Product size: 14*10*9cm Product weight: 255g Package includes: 1*Engine Note: Resin jewelry only