Commodity Name: White Ceramic Sharpener with White Handle, 8.8 inch. Type# MJ S08-W Technical Info. Material Specification: A-43-L Material Composition: Al2O3>99% L.O.I<0.73% Na2O<0.27% Fe2O3<0.01% SiO2<0.01 Material Properties: Specific density 3.93g/cm Hardness (HRC) >90 Grain size <0.4um PH =10 BET = 8.3m2/g Advantages: This ceramic sharpener is very comfortable and easy to use, the ultra fine ceramic shaft is perfect for all fine steel knife blades. It will help to maintain a razor-sharp edge for many years! Made of the advanced, high-tech Al2O3 ceramic, second in hardness only to diamond, it was originally developed for industrial applications where metal components failed. Note: This sharpener is not used to sharpen ceramic knives, only steel knives! Origin Shenzhen, China Material Al2O3 purity>95% Weight 175 Grams Packaging 1 piece per clamshell Delivery lead time 2-3 weeks Minimum order 100pcs Supply ability 10,000 pieces per month