Features: Perfect children gift. Used as a teaching tool to demonstrate how energy(heat) can be transformed into mechanic work. The heating head of the hot cylinder is made of stainless steel, it is more safe and durable than ordinary glass cylinders. Super craftsmanship. High-quality zinc alloy bracket for durability. Easy operation. Fill the bottle with alcohol（Not included), and ignite the wick. Let it burn for about 20 seconds, then give the wheel a gentle push, and it will run like a charm. You can DIY this engine with your children, which will bring them much entertainment. Specification: Condition: 100% Brand New Material: Metal Size (in bulk): 16*6*4.2cm / 6.3*2.36*1.65in Color: As Shows in Pictures Weight: 430g Package List: 1* Base 1* Flywheel 1* Cylinder set(1*hot cylinder+2*gas piston+2*connecting rod) 1* Alcohol lamp cover 2* Sealing ring 1* Cylinder compression 1* Small flywheel 1* Flywheel bearing set 1* Power Piston 7* Screw 1* Pot 1* Wick 2* Slip gasket 3* Jack screw 1* Manual Notice: Alcohol is not included. Please allow slight error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .