... - walnut shell grains. Compared with the old pore-forming material-- refined naphthalene, our product has uniform pores, and it ... kernel content: 0.4% Moisture content: 8.7%3 [Filter] walnut shellAppearance:shiny ,beautiful, brown. High-quality fruit (coconut, apricot) shell ... :Polishing process of spectecles, jewelry, button, stamping parts, electronic parts, etc. high quality Walnut shell used as ...