When you buy your Canon PG40 Black Ink Cartridge from Tonerworld, you can rest assured you are receiving genuine, quality product. Our customer service team is always available to help you should you have any questions regarding your Canon PG40 Black Ink Cartridge. Our hassle free return policy insures that should you have any problems with your Canon PG40 Black Ink Cartridge we will either replace it for you or issue a full refund.