Page Yield*: 800 per cartridge For best results, store in a cool, dry place. Use within 36 months of purchase for optimal performance. *at 5% coverage (ISO/IEC standard) Our compatible postal meter red ink cartridges all exceed USPS requirements for fluorescence Compatible with the following Pitney Bowes MailStation: K700 Color: Fluorescent Red Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.