This is a compatible replacement for the Okidata 56120401 black laser toner cartridge, designed for use with the B2500, B2520, and B2540 laser printers. It delivers a standard yield of up to 4,000 pages, ensuring reliable and high-quality printing results. Manufactured with 100% new components, this cartridge offers an economical alternative to the original Okidata toner cartridges without voiding your printer's warranty. Backed by our 100% Quality Satisfaction Guarantee.