Pitney Bowes 621-1 Red Ink Cartridge for DM500 / DM550 Postage Meters 621-1 Pitney Bowes Ink Cartridge is a direct replacement for Pitney Bowes OEM Ink Cartridge # 621-1 Use with the DM500 and DM550 Postage Meters Total Imprints 11,000, 4,500 with meter ad We only sell Postage Meter Ink and guarantee all of our ink 100%. Make sure it ships from Postageink.com! Free Shipping by Postageink.com!