Sharpstone Grinders are a high quality herbal grinder made out of aircraft grade aluminum rod. They are CNC machined ensuring that no glued in teeth. Each herbal grinder is also individually anodized to make sure scratches and smudges are less likely to occur. The teeth on Sharpstone Grinders were manufactured to be diamond shaped with razor sharp edged. You get a perfect grind down every time making the desired blend the perfect consistency for vaporizing or cooking.