Hot Air Stirling Engine Model Generator Description: Item: SIze: 165*90*90mm Flywheel: 60mm(Diameter) Driving Wheel: 25mm(Diameter) Power cylinder bore: 16mm Piston stroke: 15mm Weight: 505g Generator voltage: 5V Material: aluminum alloy Linkage: stainless steel Age: +8 Package Inclued: 1 × Model Generator