KidWind Red Blade Set, 8-inch diameter wind turbine blades are optimized to spin at very high RPMs, fit on any DC generator or motor with a 2 mm driveshaft, Recommended for College, High School, and Middle School Science
KidWind Wind Turbine Hub, three-pack of 12-hole crimping hubs, made from recycled plastic, allows you to turn any DC generator into a wind turbine, Diameter: 2.25 in, Maximum number of dowels: 12, Size of shaft hub press fits onto: 2 mm