The original Harley rat was found in a feeder tank in a pet store and was a siamese(or himalayan.. hard to tell).

There is a true hairless, which has NO hair whatsoever. They have alot of health problems and are generally only in labs. Then you have the fuzzy hairless, they all have short curly/kinky whiskers. Some have slight fuzzy hair, some are very hairless. It varies. Then you have the double rex/morphing hairless which generally don't have the reproduction problems that hairless and true hairless have.

DO NOT breed true hairless or hairless rats. They do not produce well, if at all, and will likely end up in miscarriage, hemorrhaging, don't lactate, or just don't know how to be a mother.