Lexmark Compatible CS421 Black Toner Cartridge Replacement — 78C10KO 78C10C0 78C10MO 78C10Y0 (Fits CS421 CS421dn CS521 521dn CS622 CS622de CX421 CX421adn CX522 522ade Printers)

Replacement toner for Lexmark CS421 series printers, engineered to deliver consistent, professional results for office, school, and home use. Compatible models: CS421, CS421dn, CS521, 521dn, CS622, CS622de, CX421, CX421adn, CX522, 522ade, CX622, CX622ade, CX625, CX625ade, CX625adhe. High Yield: The CS421 black cartridge produces approximately 2000 pages at standard 5% coverage; the color version yields about 1400 pages at equivalent coverage. Print Quality & Durability: Formulated to provide sharp text, vivid graphics, fast output, and long-lasting performance to handle high-volume printing demands. Easy Setup & Reliable Operation: Cartridges are designed for quick, hassle-free installation and are thoroughly tested for full compatibility with the listed Lexmark printers, ensuring dependable, high-quality prints each time. Premium Toner Formula: Uses pure color and high definition toner to achieve a high-gloss finish and crisp reproduction of graphics and text.