This is a compatible Okidata 43501901 laser drum unit guaranteed to perform with your Okidata B4400, B4550 or B4600 laser printer. It replaces the original Okidata 43501901 laser drum unit. The compatible replacement 43501901 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 43501901 and offer high-quality printing results. Containing new parts including drums, wiper blades and other internal components, they are an economical alternative to expensive OEM 43501901 Okidata laser drum units and supplies, and offer big savings over brand-name 43501901 laser drum unit and supplies. The use of compatible replacement laser cartridges and supplies does not void printer Warranty.We offer a Two Year 100% Quality Satisfaction Guarantee on our compatible 43501901 laser toner cartridges and supplies. LD © Cartridges are manufactured in an internationally certified ISO 9002 factory. LD © cartridges come with a 100% Two Year money back guarantee and technical support. For use in the following printers: Okidata B4600, B4500, B4400n, B4550n, B4550, B4600n, B4400, B4600n PS, B4500n