This hand-held knife sharpener has an advanced ceramic sharpening wheel. The strength of the ceramic sharpener gives a razor-like edge to steel knives. Simply place a knife in the slot and lightly move it back and forth several times to achieve the desired sharpness. A clear cover opens easily for rinsing the sharpener. For use only on steel, double-edged blades only; not for use on ceramic or serrated blades. Ceramic sharpening wheel manufactured in Japan.