Compatible with: Pitney Bowes Personal Post Meters: DM300C, DM400C, DM450C, 3C00, 4C00, 5C00 Page Yield*: 8,000 For best results, store in a cool, dry place. Use within 36 months of purchase for optimal performance. *at 5% coverage (ISO/IEC standard) Compatible Replacements Included: 5 765-9 Fluorescent Red Inkjet Cartridges Professionally manufactured by LD Products. Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.