This NG 4-Piece Window Grinder is crafted with aluminum , manufactured with cut teeth that ensure consistency and frictionless cutting, plus anti-slip ridges. It features a windowed, magnetized lid and teeth in varying sizes, while a pollen screen and catcher compartments complete this efficient herb grinder. Made with gunsteel and designed to last. 12 Cut teeth, Diameter: 2.0" Height: 1.5" 4 Pieces