Premium Quality LC-21M, LC-31M Magenta Inkjet Cartridge compatible with the Brother MFC 3100c, 3200c, 3220c, 3320C, 3320CN, 3420c, 3820C, 3820cn, 5100c, 5200c, IntelliFax 1800c, 1820C, 1920C, 1920cn, MFC 3220c, 3320C, 3320CN, 3420c, 3820C, 3820CN. The use of compatible supplies does not void your printer warranty. Product Detail Ninestartechonline.com