Ensure that your time clock remains operating at optimum performance levels, printing easy-to-read stamps. Airtight seal keeps ink from leaking or drying out. Compatible with Pyramid Technologies 3550SS, 3600SS, 4000PRO, 5000 and 5000HD time clocks. Device Types: Time Clock; Color(s): Black; OEM/Compatible: OEM; Printing Type: Dot Matrix.