• Professional knife sharpening stone 400/1000. • Made of white corundum stone, with fast and superior automatic pulp sharpening performance. • Superior sand material, basic grit 400/1000, friendly to your hand's skin. • Quick user guide and tips. • Made with superior silicon carbide, the 400 grit side is suitable for any daily sharpening. • No oil needed, just place the stone in water for 10-15 minutes before use. • Compatible with all types of knives, including chef's knife, hunting knife, pocket knife, Japanese knife, butcher knife, paring knife, BBQ knife, scissors, chisel, blade. • Also works for axes, carving and gardening tools. • Comes with two sharpening stones of 7 x 2.2 x 1.1 inches for beginners. • Grinding stone made of white corundum is faster in pulp and high in self-sharpening.