Hello, I have a full roll of what I believe is the G.A.P. fiberglass base. I used this on a roof, it was supplied by the customer so I'm not 100% sure that that's what it is. We used about 6' of this roll so the label was pulled off, otherwise I would just return it. Roll still measures 9-1/2 across (see photo). It runs about $43.00 per roll at Menards. Thanks for looking!