The 3 Piece Herb Grinder by Grav is 1.25 inches tall and is made from CNC aluminum. Inside, the upper chamber has 15 teeth and holes designed to prevent clogging and provide a superior grind. The bottom chamber collects pollen and includes a branded Grav scraping tool. The outer edges have ridged edges for a solid grip and grinding action. The inner walls have soft curved edges to keep plant matter from caking into the corners. The top of the grinder sports the Grav logo etched into the aluminum.