Miniature solid fuel tablets type D91 & type D92

Hello!, I'll describe them to you, their about the size & color of A silver hex nut, but they don't have a hole in them, & 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 a couple seconds later. Thank-you!