... shell particlesOur factory using foreign advanced technology specialized in vitrified bond grinding wheel hole porosity materials - walnut shell grains. Compared ... 8.7%3 [Filter] walnut shellAppearance:shiny ,beautiful, brown. High-quality fruit (coconut, apricot) shell as raw materials, it is refined ... of spectecles, jewelry, button, stamping parts, electronic parts, etc. High quality garnet Abrasive