(3 Pack) Pyramid 3600ss Ribbon Cartridge (Pyramid 5000R Compatible) fits Pyramid 3550ss/3600ss/4000Pro/5000/5000HD Time Clock Pyramid 5000r Compatible Replacement Ink Cartridge Fits all Pyramid 3550ss, 3600ss, 4000Pro, 5000, 5000HD Time Clocks 3 Individually sealed cartridges included, Jet Black ink Premium quality, guaranteed better than Pyramid OEM