Glycerin. Glycerin is an ingredient that can be found in many beauty products because of its moisture locking properties. It is a form of sugar alcohol that is available naturally in vegetable oils and can also be the byproduct of soap making.
Definition of wheel and axle : a mechanical device consisting of a grooved wheel turned by a cord or chain with a rigidly attached axle (as for winding up a weight) together with the supporting standards
A car axle is designed for front-wheel-drive, rear-wheel-drive, or four-wheel-drive vehicles. Each type of axle has a specific size and weight load capacity. The car axle connects the wheels and tires to the car. The axle has long lug studs on one end, which are mounted to wheels with lug nuts.