This black toner is properly refined to work in OKI printers. While I don't like the electronic roadblocks OKI uses to force consumers to their products, the truth is the genuine products just work better. I have tried compatible toner and had problems with image quality and proper fusing. The purity of the resin and waxes in the toner is very important to obtain good color image results. I am a low quantity user, but insist on best quality.