The Cooks Standard Professional Ceramic Rod Knife Sharpening Steel, 12-Inch/30cm is made of high quality ceramic alumina that is harder than regular steel and prevents rusting. Rod length measure 12-inch/30cm and 5/8 inch diameter without handle which is long enough for professional use. Ceramic material is wear resistant and light weight for long use. Handle is designed for safety and comfortable to hold with a stainless steel guard cap and ring. Ceramic is hard, but not break resistant. Please do not drop on ground or hit on hard surface. Wash and brush after use with regular kitchen detergent/abrasive cleanser and sponge.