... and safe. Moreover, the pore size of the grinding wheel can be arbitrarily selected. Thus, in 60 years abroad, it has ... % Moisture content: 8.7%3 [Filter] walnut shellAppearance:shiny ,beautiful, brown. High-quality fruit (coconut, apricot) shell as raw materials, it is refined handled ... spectecles, jewelry, button, stamping parts, electronic parts, etc. Walnut shell used as polishing material