SMART CRUSHER® ...Specially designed by highly sophisticated CNC machines, which utilize the latest technology in processing and shaping aluminum, providing more superior grinders with practically a zero flaw rate!Contains a special teflon O ring which makes grinding even easier with absolutely no metal shavings guaranteed!Two super strong neodymyum magnets are used to keep a nice and tight closure.his is the best selling grinder available on the market because of its size, awesome quality, and great price! Other sellers offer a smaller grinder at the same price!This is made of extremely durable, and strong aircraft grade CNC aluminum for quality, durability, preciseness, and to maintain its light weight.This is a FOUR STAGE (4 PC) grinder which means it has four chambers including a pollen catcher.This awesome grinder has CNC DIAMOND CUT RAZOR SHARP teeth to grind with great efficiency and ease.This grinder also does a spectacular job at catching and storing pollen in its fourth chamber. Contains a stainless steel micro mesh screen which allows only pollen to fall through into the fourth chamber. The grinders measurements are 2.25" Wide x 2" High.