ITEM NAME:Lab Cylinder Piston Stirling Engine ACCS Gyroscope 10000RPM Inertia Flywheel Description: - Stirling Engine Accessories- Inertial Flywheel for Lab Experiment Replacement Supplies - Diameter: Approx 65mm/2.56inch - Inside Bore Diameter: Approx 6mm - Thickness: Approx 15mm - Speed up to 10000 - Great accessories for Stirling Engine model, and gyroscope - Material: Aluminum - Color: Golden Package Included: 1 Flywheel.Great accessories for Stirling Engine model, and gyroscope. 1 Flywheel. - Color: Golden.