This is a premium cartridge, which means it is made to the strictest quality standard and is a made in the USA laser toner for Sharp MX-51NTBA works with with Sharp Laser Printers. It replaces the genuine (OEM cartridge) Sharp MX-51NTBA toner cartridge. This toner cartridge is made with top quality components and new toner to give you the highest quality printouts every time. This compatible or remanufactured for Sharp MX-51NTBA toner cartridge is specially engineered to meet or exceed the highest standards of quality, reliability and page yields. Although this cartridge is not made or endorsed by Sharp, it offers customers an economical alternative to expensive OEM Sharp MX-51NTBA cartridges and comes with our satisfaction guarantee.