This is a Fujifilm Slide Processing Mailer for one 24- or 36-exposure roll of 35mm film or one roll of 120 film. These mailers are valid until 12/31/2017. Even if your mailer says it expires earlier, it is good until the end of 2017. For amateur E-6/CR 56-compatible 35mm and 120 transparency film only. As of June 2011, this mailer now requires more than 3 postage stamps.