Partical nice Low Temperature Stirling Engine Motor Model Cool No Steam Education Toys Kit Can use pencil to lubricate all the connections, other oils are not recommended. Brand new and high quality. 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. It run on warm / cold surface, and it requires a small difference in temperatures to run. Very fantastic craftsmanship, made with Metal Alloy. Item Name: Stirling Engine. Material: Steel and Glass. Speed: up to 180-250 RPM. Start Temerature Difference: 20 . Size: 10.2cm x 10.2cm x 13cm.