The black Jende Ceramic Steel is Mohs 8, which leaves a finer finish with slightly more refinement at about 1,500 grit. While the black ceramic works on just about any kitchen knife, it works slightly better on steel types with RC 60 or more (such as Global, Shun, Maestro Wu, and Japanese Aogami and Shirogami high carbon steels. etc.). 

The Jende Black Ceramic Sharpening Steels have break resistant technology in the tips and handles that make these sharpening steels actually usable in an active kitchen setting, minimizing the worry of breaking from the slightest breeze or hard stare. The handle is also a sturdy stainless steel with a polypropylene grip.