This boat shape stone is made of first grade quality material, high temperature and 18-24 hours Constant temperature baking, sharpeness, hardened and high quality for long time use.Products Features:made of high quality material#60-#12000 can be customizedSharpeness, hardened and quality for long time use.Sharpening stone.A whetstone that needs to be soaked in water before useArt No.SizeGrit Qty/Inner box Qty/Ctn 4090366"/150mm#60-#12000 1PC 50pcs4090388"/200mm#60-#120001PC 50pcs40904111"/275mm#60-#120001PC 20pcsWelcome to inquiry and order. For more production information, please contact or mail. Our professional customized high quality stone will be provided to you with guarantee and exccelent service.