Made of strong anodized aircraft-grade aluminum alloy and manufactured with CNC (Computer Numerical Control) machinery, the Instapark herb grinder is an invaluable & indispensable tool to own when it comes to grinding your spices, herbs, tobacco and etc. Featuring a 4-chamber design, the top and bottom grinder are held together by strong neodymium magnet to ensure a tight & secure closure. In between, there"s a specially designed Teflon O-ring preventing metal chipping. Each grinder is individually tooled with CNC machinery and its diamond shaped teeth are optimally & evenly distributed for easy and efficient grinding. The next chamber contains a stainless steel micro mesh screen which allows only pollen to fall through into the last chamber, the pollen catcher. All Instapark grinders are backed up by a standard 5-year manufacturer"s warranty.