... , long-wearing Item Name: Corundum knives sharpening stone #600 oil stone delicate Other Name: Alundum sharpening tool, Abbrasive stone, grinder, whetstone, hone Advantages: Beautiful shapes ... # 240# 320# 400# 500# 1000# 4000# 6000#Alundum carbide sharpening stone, oil stoneIngredients: corundum, carbide silicon, china clay, feldspar and dextrin Shapes: Rectangular, square ...