When you buy your Lexmark 40X8420 Maintenance Kit 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 Lexmark 40X8420 Maintenance Kit. Our hassle free return policy insures that should you have any problems with your Lexmark 40X8420 Maintenance Kit we will either replace it for you or issue a full refund.