Refill the ink of your Brother laser printer with Brother TN-421 toner cartridges. They fit in various Brother DCP, HL, and MFC laser printers, such as the MFC-L8900CDW and DCP-L8410CDW laser printers. These 421 toner cartridges don't fit in every Brother laser printer, so always check the product page if your printer is suitable. You can choose from black and white, color, and combo packs. You can print up to 3000 pages in black and white and up to 1800 pages in color.