(2 Pack) Ribbon Cartridge for Pyramid 3550ss, 3600ss, 4000Pro, 5000, 5000HD Time Clocks (5000R Compatible) Pyramid 5000r Compatible Replacement Ink Cartridge Fits all Pyramid 3550ss, 3600ss, 4000Pro, 5000, 5000HD Time Clocks 2 Individually sealed cartridges included, Jet Black ink Premium quality, guaranteed better than Pyramid OEM