RT Universal Troy 02-81350-001 / HP CE390A (90A) MICR Toner Cartridge (10k Yield) for Troy/HP 601, 602, 603, 4555 Series Lifetime Warranty. We only guarantee products ordered directly from Renewable Toner Magnetic toner for check printing Replaces OEM Part #: HP CE390A / TROY 02-81350-001 Yield: 10k standard pages @ 5% coverage; prints 30k checks @ 3 per page Troy / HP Printers: TROY 601, 602, 603; HP LaserJet M601, M602, M603, M601n, M602n, M603n, M601dn, M602dn, M603dn, M602x, MM603xh, M4555f, M4555h, M4555fskm MFP