Precision Grinding Teeth Sustainable Black Walnut Removable Screen 2.35” x 2.35” The Marley grinder is made of natural wood, and comes with a removable grid included, it can hold the contents of your grinder. Precision Grinding Teeth Sustainable Black Walnut Removable Screen 2.35†x 2.35†The Marley grinder is made of natural wood, and comes with a removable grid included, it can hold the contents of your grinder.