This is a compatible Sharp MX-312NT black laser toner cartridge guaranteed to perform with your Sharp MX-M260 and MX-M310 laser printers. It replaces the original Sharp MX-312NT toner cartridge and is manufactured with 100% new components. This cartridge delivers a standard yield of up to 25,000 pages, providing an economical alternative to expensive OEM options. The use of compatible cartridges does not void your printer's warranty, and we back our products with a 100% Quality Satisfaction Guarantee.