Made and supported in the USA by Print.Save.Repeat. (Ranked #346 on the Inc. 500 Fastest-Growing Private Companies List) Guaranteed to meet or exceed all OEM standards for page yield and print quality. Unconditional Satisfaction Guarantee that extends beyond Amazon's 30 Day Return Policy. Page Yield Rating: 20,000 pages @ 5% toner coverage Compatible Lexmark Printers: MS431dn, MS431dw, MX431adn, MX431adw Compatible Lexmark Part #s: 55B1X00