Wrecking Yard/Recyler "Ink Pen"?

I have always been amazed how the yellow paint markers that junk yards use to identify their auto parts are so durable, long-lasting, maybe even indestructible. I would like to have one or two of those "pens" myself to permanently mark stuff around here. Is this a product available to John Q. Public or is it reserved to the alchemist community? (probably out-lawed in California). Thank you.