Malpaso, how about "Jon-E"? That's close. I have several left over from forty years ago. They definitely beat the chemical throw aways so common now. Nice thing about them is, you can put them out and relight them later. I think they are still on the market.

The disposable "shake em" hand warmers are fine for several hours. I read somewhere that you can stuff a hot one in an airtight container to extinguish them and then take them out later, shake them and rejuvenate them for whatever life they have left. I have never tried it and frankly, I am suspicious that it will work. Anybody tried it?
Boone