Genuine Pyramid replacement ribbon for 3550ss, 3600ss, 4000Pro, 5000 & 5000HD Time Clocks Use only genuine Pyramid replacement ribbon for optimum time clock performance and full protection Jet black ink Airtight seal prevents ink from leaking or drying out Features easy-grip tab for quick installation Made in USA Lasts 60% longer than compatible replacement ribbons Genuine replacement ribbon for models 3600SS, 5000+, 5000+HD, 3550SS and 4000Pro Sealed construction for long life & clean usability Features easy-grip tab for quick installation Jet black ink for optimum readability Made in the USA