Low Temperature Difference Stirling Engine DIY Toy Gift Decor Collection Low Temperature Difference Stirling Engine DIY Toy Gift Decor Collection Low Temperature Difference Stirling Engine DIY Toy Gift Decor Collection Low Temperature Difference Stirling Engine DIY Toy Gift Decor Collection Low Temperature Difference Stirling Engine DIY Toy Gift Decor Collection Low Temperature Difference Stirling Engine DIY Toy Gift Decor Collection Very fantastic craftsmanship, made with Metal Alloy Being a Gift, or a Display on your desk or anywhere ! The hotter it gets, the faster it goes! This low temperature stirling engine, It run on warm / cold surface, and it requires a small difference in temperatures to run. Description: Item Name: Stirling Engine Size: 102 X 102 X 125mm Material: Steel and Glass Speed: up to 180-250 RPM Start Temerature Difference: 20 ℃ Weight: 250g Features: This Low Temperature Stiring Engine could be a great gift for your friends or families. It is almost ready to run: after the installation, put it on a cup of hot water, then it will run itself. Note: Can use pencil to lubricate all the connections,other oils are not recommended. Package Included: 1 x Low Temperature Stirling Engine