flywheel powered car canvas micarta, aluminum, steel. wheels are 5" diameter o rings. flywheel is made from a giant 5" plus gage pin. ratio is 28:1 which means for every 28 revolutions of the flywheel, the machine travels 15.7" or one full revolution of the wheel. an accelerator with a one way clutch allows the operator to use an electric hand drill and accelerate the flywheel and achieve a flywheel speed over 2000 rpm. ball bearings throughout.