Because PRO-LINE''s specially formulated polypropylene has a physical density that is less than other sleeving materials, it is more pliable and gentle to your film. Strong and durable, PRO-LINE won''t become brittle or abrade film. PRO-LINE sleeving is optically clear, color neutral, and has a unique anti-Newton ring surface that reduces distracting Newton rings as well as minimizing the actual surface area that is in contact with your film. Available for slides, roll film and sheet film up to 20x24 inches.