Epson WP-M4000/M4500 Inkjet Cartridge Black C13T74414010. Page Yield Up to 10000 pages. To continue getting the superior results that you've come to expect with your Epson WorkForce Pro WP-M4000 series printer, install a genuine Epson T7441 Black Inkjet Cartridge. This ink cartridge is formulated to get the best results possible from your Epson WorkForce Pro. With a page yield of up to 10,000, this cartridge is easily installed and replaced and will deliver consistently crisp and precise black text for documents or black and white photos.