Excerpt from Cinestill.com
"CineStill bwXX is a high speed, classic black & white film emulsion, with an EI of 250 under daylight and 200 under tungsten lighting. Recommended development in Kodak D-96 developer, but is compatible will all black and white film developers.
Double-x is a classic black and white film stock left relatively unchanged since it's release in 1959 for still and motion picture use. Some of the movies using the classic Eastman double-x film stock (5222) include: Schindler's List (1993), Memento (2000), Kafka (1991), Casino Royale (2006), I'm Not There (2007), and many many more.
Kodak no longer offers this wonderful still stock to the still photography community so CineStill Film has decided to release and distribute it under their label. This is a limited run (only 2000 rolls available) sold out fast, but if all goes well it will become a regularly stocked CineStill Film's emulsion.
CineStill bwXX is an excellent choice for those looking for a classic film stock to fill the void left by the discontinuation of it's wonderful sister films, Kodak Plus-x (discontinued in 2010) and TXP320.
36 exposures professionally spooled into high quality 135 Non Dx-Coded Cartridges"