Negative Sleeves for 35mm Film from Rollei is designed to hold 7 strips of film each with 6 frames across. The glassine pages will conveniently sit within a 3-ring binder, and the pages are made of finely ground pulp paper that is acid- and lignin-free. Therefore, the paper is of a museum quality and suitable for archiving materials in the long term. Also, the paper is grease-proof and water resistant.