Renewable Toner 43501901 Compatible Image Drum For Okidata B4400 B4500 B4550 B4600 Printers LOW COST, HIGH VALUE. RT replacement for HP 43501901 drum cartridge. Printing cost is as low as .005 cents per page, up to 60% less than HP 43501901 original toner cartridges. QTY: 1 (1 Black) RT Compatible HP 43501901 drum cartridge Yield: 25,000 pages based on 5% coverage Compatible with Okidata B4400, B4500, B4550, B4600 printers LIFETIME WARRANTY. We honor our warranty regardless of purchase date, even if the Amazon return window has closed