1 Private upper adhesive (resin) coated abrasive sand on the support after baking to prevent the loss of sand is coated with a special resin.
2 Anti-clogging Coating (Stuffed coating) stuffed between the sand lest while sanding is coated with zinc stearate.
3 Top Size (Cool Coating) melts at high temperatures, dry etching, which absorbs the heat generated during the incineration of chemical inhibitors finish.