[Fine workmanship] Full metal body. Made of aluminum alloy and alloy steel. and coloring process. The surface is fine and smooth. The engine is small and powerful, one-button start.[Engine kit] It is composed of hundreds of parts. The parts are processed by CNC to show the creation of human wisdom. Some parts require DIY assembly by users. Self-organized creation is more interesting.[Engine Performance] Speed: 2500-10500 rpm Stroke: 17.0mm Cylinder Diameter: 16.60mm Displacement: 3.5cc : 0.5ps.[Real machinery] Highly simulated, closer to the real engine, long stroke, effectively providing higher torque.[Engine use] Model , model boats, model aircraft and other equipment. The kit is also suitable for decoration, science and education, exhibitions, etc.size: 100.5 x 81.6 x 84.61MMMaterial: Aluminum alloy + alloy steelcolour: blackPackage Contents:1 x Engine complete machine1 x Start motor + ten-tooth adapter7 x fan blades1 x Motor bracket gasket1 x Spark plug1 x Start belt1 x Hall sensor bracket2 x Motor fixing screws1 x Chinese-English InstructionOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.