Pyramid 4000R Compatible Replacement Ribbon Cartridge for Pyramid Time Clock Models 3500, 3700, 4000, 4000HD Pyramid 4000r Compatible Replacement Ink Cartridge for Pyramid 3000HD, 3500, 3700, 4000, 4000HD Time Clocks Replacement Cartridge is a direct replacement fit for the Pyramid 3500, Pyramid 3700, Pyramid 4000, and Pyramid 4000HD Time Clocks Black ink Ribbon shield included and pre-installed on cartridge