Activity & Learning Toys

AYUNJIE Metal Stirling Engine Model Kit, 2 Cylinder Stirling Engine Hot Air External Combustion Engine with Voltage Digital Display Meter Bulb, Physical Model Metal Stirling Engine Model Kit, Dual heating cylinders + dual power cylinders are arranged side by side, with a small generator, full of metal mechanical and technological sense. High Quality: As the flywheel rotates at high speed, feel the magical... AYUNJIE Metal Stirling Engine Model Kit, 2 Cylinder Stirling Engine Hot Air External Combustion Engine with Voltage Digital Display Meter Bulb, Physical Model