The bottom plate is made of hard metal finely polished, exquisite atmosphere; the bracket is made of zinc alloy casting, which is stable and strong; the flywheel, cylinder liner, and shifter piston are made of aluminum alloy precision turning, precision milling, and the texture and beauty are combined; the connecting rod is made of stainless steel. Manufacturing; the power cylinder and the hot cylinder are made of glass, which is transparent and intuitive; the overall model is exquisite, atmospheric and beautiful; the demonstration principle is intuitive and clear. The wheel and axle connections are all connected by high-precision micro-bearings, and the bushings are precision polished with brass, which is stable No lubrication is required.