Feature: 1. Metal Material: CNC craft casting, aluminum alloy oxidation color, collectible crafts, classic structure, clear transmission process. 2. Design Inspiration Source: Product design inspiration from the history of human industrial science and technology with representative and nodal classic creation, excellent works, scaled modeling, highly reversible. 3. Prototype: The classic inventions and products in history as the design prototype, presenting the core principles of machine operation, intuitive display of the application value of the machine. 4. DIY Operation: More than 300 parts are exquisitely polished by special abrasives, the product can be upgraded, combined, conversion power system through the specified kit or DIY modification. 5. Easy To Assemble: The original product requires the user to assemble the whole machine with parts, the whole process is close to the professional assembly line process, an interesting and challenging experience. Specification: Item Type: 4 Cylinder Engine Kit Material: Aluminum Alloy, Stainless Steel Battery Type: Lithium Battery (Shipped With Built in Battery) Battery Capacity: 450mAh Charging Time: 2 Hours Endurance Time: No Less Than 30 Minutes On A Full Charge Assembly Time: 4 Hours Applicable Age: 10 Years Old And Above Product Size: Approx.158.5 x 182 x 117mm / 6.2 x 7.2 x 4.6in. Package List: 1 x Cylinder Block1 x Oil Sump1 x Oil Filter1 x Generator1 x Starter Motor Front Cover1 x Starter Motor Rear Cover1 x Crankshaft1 x Water Pump Cabinet1 x Circuit Board1 x Motor Wire1 x Battery Box Top Cover1 x Battery Box Bottom Cover1 x Cam Holder1 x Battery Assembly Kit1 x Battery Cable1 x Cylinder Head2 x Camshaft2 x Air Duct Mounting Bracket1 x Generator Front Cover1 x Generator Rear Cover4 x Piston1 x Water Pump Pulley4 x Piston Pin1 x Starter Motor Front Cover1 x Generator Pulley4 x Piston Rod8 x Air Inlet Pipe1 x Water Pump Shaft1 x Chain Guide Block1 x Chain Tension Block1 x Switch1 x Starter Motor Middle Cover1 x Water Pump Cover4 x Sparking Plugs1 x Starter Motor16 x Valve1 x Tension Wheel1 x Water Pump Impeller1 x Tension Block1 x Synchronizing Chain Block1 x Timing Chain1 x Left Camshaft Sprocket1 x Right Camshaft Sprocket1 x Crankshaft Synchronizing Sprocket1 x Starter Motor Gear1 x Tension Base1 x Flywheel1 x Crankshaft Pulley1 x Rear End Cover1 x Front End Cover4 x Engine Mount2 x Boxes Accessory Screws1 x Charging Cable1 x Screwdriver3 x Wrench1 x User Manual1 x Storage Box