When you buy your HP 45 HP 51645A 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 HP 51645A Black Ink Cartridge. Tonerworld ships all orders the day they are placed so you can be sure you will receive your HP 51645A Black Ink Cartridge promtly. Our hassle free return policy insures that should you have any problems with your HP 51645A Black Ink Cartridge we will either replace it for you or issue a full refund.