This is a compatible Okidata 43501901 black laser drum unit designed to work with your Okidata B4400, B4550, or B4600 laser printer. It delivers a standard yield of up to 25,000 pages, ensuring high-quality printing results. This economical alternative to the original Okidata drum unit is remanufactured using both OEM and non-OEM parts, providing reliable performance without voiding your printer warranty. Backed by our 100% Quality Satisfaction Guarantee.