Boker Magnum Sieger Long Life Knife Sharpener. 8" synthetic ruby sharpening rod. Black composition handle with hanging hole. Rod is 20 times harder than hardened steel. The most unusual thing about this sharpener is the high efficiency (less time for sharpening) in combination with an extraordinary fine edge leading to high edge retention. May be used wet or dry. Easily cleaned using a wet cloth or sponge.