Zwillling J.A. Henckels is proud to partner with "The Master of the Blade"-Bob Kramer. Bob Kramer Carbon is a return to straight carbon steel, a material nearly lost to the home kitchen. To maintain these knives Bob Kramer and Zwilling J.A. Henckels produced the perfect honing and sharpening collection. This honing steel features a ceramic rod, which allows you to combine regular maintenance of straightening the edge with a subtle sharpening of a ceramic surface ensuring a razor-sharpness. This ceramic steel offers a 70 Rockwell Hardness, much harder than a regular honing steel. Made in Japan.