The very high capacity MX-51GTCA toner cartridge comes from Sharp themselves to offer you the very best quality of print available for the MX-4140N or any other compatible laser printer.Each genuine Sharp MX-51GTCA toner cartridge offers an estimated 18,000 prints (at a 5% page coverage), making them a supremely efficient solution for nearly any busy office. The quality of the cyan toner powder and the precision with which all parts of the Sharp MX-51GTCA have been manufactured are breathtaking and we are sure you will be delighted with the results.Purchasing original toner cartridges like the Sharp MX-51GTCA is always great for your peace of mind, but this product also comes with a full guarantee with the manufacturer directly, to ensure that you are happy with your purchase.