This is a compatible PSI 18104 black laser drum unit guaranteed to perform with your PSI printer. It replaces the original PSI 18104 black laser drum unit. The compatible replacement 18104 laser 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 18104 and offer high-quality printing results. Remanufactured using both OEM and non-OEM parts, they are an economical alternative to expensive OEM 18104 PSI laser drum units, and offer big savings over brand-name PSI supplies. The use of remanufactured replacement laser drum units and supplies does not void your printer warranty. We offer a 100% Quality Satisfaction Guarantee on our compatible 18104 laser drums and supplies.