Originally Posted by rocket_james

Several vendors started providing these in lieu of the flat paper rings like Estes' CR-2060. The material they're made out of leaves a black residue on anything they touch. I think even Semroc was using them for a period of time, although the last order I got were different, and very nice. The last order I got from BMS about a year ago included those. They don't specifically state that's what they're made of, so you don't know it until you get them. I got one of the Saturn 1-B rockets from Zooch Rockets and those were loose in the box with the wraps and tubes. The stuff was all over the place. The instructions even mentioned to clean off any residue that might have gotten on the wraps. I ask now to be sure that's not what I'm getting. I won't scan one for you, for obvious reasons.
James