I don't know if it is true, but along time ago, when I was first diagnosed I was told t-1's were more likely to sweat something that was more caustic than the general population and that the sweat was distructive to sterling silver. I have always got my tags from Medic Alert out of Turlock, CA. They keep a data base that includes your doctors names and phone numbers. If someone calls their number any time of day they will give you emergency contact info. This was great in the good old days but with cell phone technology, I believe they are not as popular as they once were. They have very durable stainless steal tags and sterling silver too. They offer a lot of choices and they are online.