The Compatible Brother LC-41BK Ink Cartridge are compatible ink cartridges that are manufactured by a third party that is ISO 9001 certified, not by the OEM (Original Equipment Manufacturer). This compatible/remanufactured LC41BK printer cartridge is designed to meet or beat OEM standards when it comes to printing quality and longevity. Enviro Ink offers a Premium Compatible Brother LC-41BK Ink Cartridge at a significant price savings when compared to the original Brother LC-41BK. Put money back into your pocket by purchasing an environmentally friendly Ink Cartridge from Enviro Ink! Don't forget, all of our Remanufactured and Compatible Ink and Toner Cartridges come with our 100% Money-Back Satisfaction Guarantee.