The Max Protection Silver Comic Bags are an acid free, archival quality product made of crystal clear polypropylene. 1000 Max Pro Silver Age Comic Book Poly Bags - 7 1/8 X 10 1/2 -Archival Safe. 2 CASE LOT (2000) Max Pro Silver Age Comic Book Poly Bags 7 1/8x10 1/2 Acid Free.