Desc: Walnut sand abrasives, walnut shell is the inner pericarp, exocarp and mesocarp in the immature is green, mature off.Walnut shell is a kind of degre...
Desc: Walnut sand abrasives, walnut shell is the inner pericarp, exocarp and mesocarp in the immature is green, mature off.Walnut shell is a kind of degre...
