Cali Crusher&reg; Homegrown Standard 4 Piece Hard Top Herb Grinder &ndash; Copper Cali Crusher brings you the revolutionary USA-made Homegrown grinder. This grinder features the latest in patented technology to provide you with the most cutting edge features you have seen yet. Better still these grinders were Homegrown in San Diego, California. 4 piece grinder made from 6061-T6 aerospace grade aluminum featuring patented dual action radial cut teeth for maximum shredding. Contains neodymium rare earth magnets for superior closure. Patented Quick-lock threads so you never have to worry about a stuck mis-threaded grinder again. A removable 210 micron count screen allows you to catch the finest pollen as well the flexibility to replace the screen with a finer or courser micron count. Grinder comes with a velvet bag and pollen scraper