Smith's® Edge Pro Compact Electric Knife Sharpener. Features electric and manual sharpening in one ergonomically designed, compact unit. Made from bonded synthetics that are selected for their ability to guarantee longer wheel life, uniform cutting, and minimum heat buildup. The crossed ceramic rods in the manual slot are used for finishing or maintaining an already sharp blade. Smith's recommends always using ceramic rods for final edge honing after you sharpen using the synthetic wheels.