dymomite label maker, ebay, get the old, chrome metal wheeled ones and nonadhesive aluminum rolls ... that may be what you are referring. There are other larger metal tape label makers out there but they get pricey. In the end I think cut aluminum from roof flashing with stamped letters is likely the best way, I will be switching to them. I have hundreds of the aluminum tags mentioned above and they work fine i just question whether they will last beyond a handful of years.