Save and print even more when you shop with LD Products! This offer includes 1 compatible replacement for Lexmark 521 black / 52D1000 black toner cartridge. Why pay twice as much for expensive brand name toner when our quality replacement printer supplies are backed by a 100% satisfaction and lifetime guarantee? For use in MS Series: MS810de, MS810dn, MS810dtn, MS810n, MS811dn, MS811dtn, MS811n, MS812de, MS812dn, and MS812dtn printers. Please note, retail packaging may vary, and these cartridges will only work with printers purchased within the United States and Canada.