Smart Crusher Black Aluminum 2.5 Inch 5 Piece Herb Grinder Magnetic Cnc Herb Press SMART CRUSHER 5 Piece Grinder Press and Scraper Razor sharp DIAMOND Teeth Contains a special teflon O ring which makes grinding even easier 2 Micron Count Tested Stainless Steel Pollen Screens HERB PRESS-- Each one is beautifully designed using superior quality aluminum