... odorless, non-polluting, easy to use, 3 inexpensive and safe Garnet Abrasive1.pore-forming materials] walnut shell particlesOur factory using ... is odorless, non-polluting, easy to use, inexpensive and safe. Moreover, the pore size of the grinding wheel can be ... : 8.7%3 [Filter] walnut shellAppearance:shiny ,beautiful, brown. High-quality fruit (coconut, apricot) shell as raw materials, it is refined ...