If your talking EID I prefer STEEL. Red hot, then place to hide. If your talking plastic I have none but did see some that have a tag on the pin along with the tag; I think they are form du flex or something. Those would be nice if they are not overly priced.
We use Ritchie tags that you can engrave the number on it. I think TB was talking about AL-Flex tags.
Use to use the tags that you wrote on with the ink, but they faded over time. Like the newer ones, can still read them after 10 years.