This is a compatible Okidata 42918104 black laser drum unit designed to work with Okidata laser printers. It replaces the original Okidata 42918104 drum unit and provides a standard yield of up to 42,000 pages. This economical alternative to the OEM 42918104 drum unit offers significant savings while maintaining quality and reliability. The use of compatible replacement drum units does not void your printer warranty. Backed by our 100% Quality Satisfaction Guarantee.