Compton Grinder 2.5 Two Piece Herb Grinder Black, Sold by Manufacturer Portable, easy to carry in your pockets Made from aircraft grade Aluminum Contains a rare earth Neodymium magnet, the strongest available on the market Perfectly spaced razor sharp diamond teeth that have been tested to maximize the cutting efficiency, creating that perfect west coast cut and are backed by a LIFETIME warranty. Teflon grade O-rings make for supreme grinding and no "Metal on Metal" friction