Ultimate Edge knife sharpeners use an elliptical shaped diamond rod. We have discontinued these items. Please choose from the links at the left to access our other sharpening products. We carry many different brands. DMT diamond knife sharpeners use mono crystalline diamonds, EZE Lap uses poly crystalline diamonds. Lansky makes a variety of synthetic and diamond sharpening kits. GATCO makes kits with synthetic and diamond stones. Smith’s is a traditional knife sharpening company that is now making many synthetic, diamond, and Arkansas style sharpeners. Edgemaker uses pull through sharpening. Of course, do not forget our own STROPBLOCK. Our STROPBLOCK is an old fashioned sharpening strop, mounted on a wood base, with chrome oxide polish embedded in a leather surface. If you prefer the Ultimate Edge elliptical style rods for sharpening, they are available thru Smiths with a hole break up pattern similar to DMT.