This Stirling engine model adopts T-shaped rocker crank a structure, which has the characteristics of and high speed; the moving parts of the whole machine are inlaid with rolling bearings, and the friction coefficient is low; the cylinder is precision ground with SUJ-2 alloy steel, with clearance Precision, high hardness and good wear resistance the overall connection is fixed by screws, all connection parts are sealed by copper pads, and the performance is and high temperature resistance; high-density aluminum alloy heat sink, higher heat exchange rate; base with double-layer spring shock absorption, Smoother operation; all-metal material, ultra-small size, structure, high reliability Industrial-grade processing level, creating an all-metal exquisite model, unique and innovative, is a novel fashion gift and collectible; the whole machine is assembled by more than 150 , including 12 rolling bearings, 30 stainless steel , etc .; the appearance parts are made of 6061 Sandblasted and oxidized surface of CNC aluminum alloy after processing Significance and Value of Use: The product can be used as a decoration with collectible value. The principle of the Stirling engine model is intuitive. It can be used as an educational toy to help develop childrens interest in learning. It can also be used as a teaching experiment device for classroom use. Simple and convenient, entertaining and , through the hands-on operation, a more intuitive understanding of the principles of the Stirling engine model Product Parameters: Overall Machine: length 108(L) x 70(W) x 78(H)mm; Number of Cylinders: 2; Bore Diameter x Stroke: 10mm x 10mm; Speed: 3700-4000 rpm; Flywheel Diameter: 36mm Colour:As Shown Material:Metal Package Contents: 1 x Stirling Engine Model Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.