Compatible cartridge for Pitney Bowes DM300c DM400c DM450c Red Ink Cartridge REPLACES PITNEY BOWES # 765-9 For Machine Series: DM300c DM400c DM450c 3C00 4C00 5C00 Yields up to 8 000 impressions without an envelope ad. Approximately 4 000 impressions with an envelope ad