Ceramic sharpening steel with anti-break and shock-absorbing qualities. Surface hardness is 9 on the Mohs scale or 1200 grit. This steel will sharpen and straighten. Particularly good for knives with a harder metal (eg Global, Shun). Maintenance: clean with ajax or gumption on a scourer. Grease can wash off with detergent. Length: 40cm. Weight: 160g. Made in Sweden.