Filmguard 120 1000 ft. (305m) Clear SleevingThis 1000' clear roll of Polyguard Continuous Film Sleeving from Lineco is made to store and protect 120 negatives or transparencies from handling and outside contamination. The 3 mil archival polypropylene material provides high diffusion while retaining light transmission. The sleeves are archival, which means they're suitable for long term storage. This roll comes unperforated. 120 format 3 Mil Polypropylene has high diffusion while retaining