[1 Year Waranty]IMAGE Set 6pc Sharpening Stones for Kitchen Knife Sharpener Professional Sharpening System-stone grit: #180#400#800#1500#2000#3000 Sharpens stainless steel, carbon steel knives, pocket, camping and fishing, fillet knives, swords Particle size: 180# (US 120 grit); 400# (US 280 grit); 800# (US 480 grit); 1500# (US 800 grit); 2000 Stone grits are comparable to how sandpaper is graded the lower the number the rougher the cut. Size: 5.8" * 0.78" * 0.2" Package includes: 6 pc Sharpening stones. Note: Only sold by Brainytrade is the real one you see, and you will be offered the best service we could give