This herb grinder is produced by a small women-owned business and is made from heavy duty zinc alloy. It measures 2.5 inches round (average size) and consists of four individual pieces, three chambers and a mini pollen scraper. The top lid is magnetized to keep your precious herbs safe from spills. It also features razor sharp, diamond-shaped teeth to grind even the 🏵toughest of herbs🏵 and a mesh screen filter to sift out the pollen. ;-)