FeaturesSpeed: 1700-2000 RPMMaterial: stainless steel, brass, bearing steel, aluminum, quartz glassSize: 165 x 95 x 120mm (6.5 x 3.7 x 4.7 inch)Size of flywheel: 60 x 9mm (2.36x0.28 inch)Net Weight: 810g (1.79 lbs)Package List1 * Stirling Engine1 * Detailed User ManualNoteDo not touch the test tube and the metal connected to it. Beware of burns.Not suitable for children under 13 years
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