4inkjets.com's compatible Okidata 56120401 black laser toner cartridge is guaranteed to perform with your Okidata B2500, B2520 or B2540 laser printer. It replaces the original Okidata 56120401 laser toner cartridge. The compatible replacement 56120401 laser toner cartridges and supplies (also known as generic) are specially engineered to meet the highest standards of quality, reliability and exceptional yields that meet or exceed OEM (Original Equipment Manufacturer) standards for the 56120401 Okidata laser cartridge and offer high-quality printing results. Manufactured brand new, containing 100% new components, they are an economical alternative to expensive OEM 56120401 Okidata laser toner cartridges and supplies. The use of compatible replacement laser toner cartridges and supplies does not void your printer's warranty. We offer a 100% Quality Satisfaction Guarantee on our compatible 56120401 laser toner cartridges and supplies.