Miniature solid fuel tablets type D91 & type D92

Hello!, I want too know for sure of the exact full name of these items?, & where I can buy them?, & the manufacturer of them?. I'll describe them to you, their miniature about the size & color of A silver hex nut, & I peel the back off of them as I would A postage stamp, these items have a round self adhesive back so I can stick them to A surface, & then I light them up with my lighter, & then they go off as A whitish flare for about 50 seconds, & then they die down & go out . If you can help me out so that I can be sure of the exact full name of these items, I'd appreciate that any hints & clues will do too!?. Thank-you