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Four Seasons sells them (www.fsguns.com). Woburn, at Winn St. It's the center of a much larger target. The lowest scoring ring is an 8.
There's no identifier. It's a 12" x 18" sheet of black paper with 3 very large rings sold at FS. I've never seen them for sale anywhere else. Packs of 100 I think.
I'll take a picture of one when I have time