Black Leaf®'s four-piece grinder is natural walnut wood, while the grinder and sieve are made of aluminum. The wave teeth are as sharp-edged as a guillotine, so that herbs, spices and even harder material are reliably shredded and ground. Openings of different sizes ensure a more even distribution of the regrind and the very finely ground one trickles directly through the removable sieve into the rounded pollen chamber.