Our remanufactured replacement for the PSI 18104 black laser drum unit is professionally re-engineered to produce the highest quality printouts for your PSI printer, meeting or exceeding OEM (Original Equipment Manufacturer) standards. Retaining the original housing, we've remanufactured using both OEM and non-OEM parts. Why buy expensive OEM PSI 18104 laser drum units when our replacement compatible PSI 18104 laser drum units are Guaranteed to deliver excellent, dependable results, page after page? Use of our compatible PSI 18104 drum unit does not void you printer's warranty.