This is a very well manufactured grinder and produces a perfectly ground herb. I was hesitant to buy a grinder made of aluminum, but I read what Dr. Andrew Weil had to say about anodized aluminum: “Anodization subjects the surface of aluminum pots and pans to a process that builds up the metal’s natural coating of oxide. This should yield a hard, nonreactive substance that forms a tough coating.” I still have some concerns about grinding and grinding and what that will do to the oxide coating, but overall, I think it’s safe. I would love to see one of these in stainless steel, but no one makes one!!!