Each individual sleeve holds a strip of 4 frames. The rolls are 1,000 feet in length giving approximately 5,050 sleeves per roll. Noritsu Style sleeving is high quality non-perforated, anti-static sleeving with black sensor bar. Sleeving has a Matte surface which provides a softer appearance to the negative. Sleeving is designed for use with Nortisu sleevers and Type-N Crown sleevers. Archival; and acid free HDPP high density. Holds 35mm film. 2 rolls per case.