Pinit POLYESTER (Mylar) Sleeve. 5-3/8 x 7-1/4" 4 mil. No flap. Use for 5 x 7" Photos. Indefinte storeage. SKU: S525R-A (0)No Reviews yet Add to Shopping Cart Details Museum Grade Polyester (Mylar) Sleeve 5-3/8 x 7-1/4" (inside). 4 mil. No flap.Archival. Crystal clear. Passed the Photo Activity Test (P.A.T.) and app... Details Back DetailsMuseum Grade Polyester (Mylar) Sleeve 5-3/8 x 7-1/4" (inside).4 mil. No flap.Archival. Crystal clear. Passed the Photo Activity Test (P.A.T.) and approved by the Library of Congress for indefinite storage (hundreds of years).Use for 5 x 7" Photos. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review