Print Checks Like a Pro with RT Universal MICR ProductsRT Universal HP 90X CE390X MICR Toner Cartridge• Quantity: 1 Magnetic Toner Cartridge for Check Printing. • Yield: 24k pages based on 5% coverage, prints 72k checks @ 3 per page. Please Note: actual yield may vary depending upon the amount of print on the page and other factors. • Compatible Printers: the RT universal HP CE390X MICR cartridge is designed for HP Laser Printers M602dn M602n M602x M603dn M603n M603xh M4555f M4555fskm M4555h.The Renewable Toner Advantage • Superior Support. We know printing is important - that's why we have a U.S. based customer support team. •Lifetime Warranty. Contact us with any technical or product issues and we will be happy to assist you.Printing Tips • A common error is the “non-genuine” message. If this occurs with the RT universal HP 90X CE390X MICR cartridge, press OK or Continue repeatedly to dismiss the message. The printer will resume your print job.• If you order more than one cartridge, please test them all. Despite the extreme care we take in packaging, sometimes items are damaged during shipping and this can affect print quality. • Contact us in the case of a malfunctioning cartridge, so we can immediately send an RT universal HP 90X toner cartridge. Happy Printing!