Features: 1.The bottom plate is made of brushed stainless steel, exquisite and beautiful 2.This frame is CNC machined and the surface is sandblasted for firmness 3.The heating cylinder is made of thick glass material, without pressure for long?term heating 4.Widely used, suitable for children's science projects, physics / mechanical learning, teacher demonstration props in the classroom 5.The operation is simple, long service life, let the light burn the round cylinder for about 60?100 seconds, then gently push the wheel, it will run specification:Item Type: Stirling Engine PackageList:1 x Engine1 x Light Bulb(random color)1 x Bottle1 x Rubber Band(Random Color)1 x Qartz Tube1 x Small Light3 x Small Rubber Ring1 x Screw NotePlease note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.