Mendo Mulcher Billet Aluminum 4 Piece Grinder with Screen (2.25 Inch (Medium), Aluminum) Crafted in Mendocino County, California USA Lifetime Warranty. Solid. Built Like a Tank. Possibly the Last Grinder You Will Ever Need. Heavy Duty Aircraft Grade Billet Aluminum (6061-T6 Bar Stock) Easy to Clean. Minimal Maintenance. Twice the number of grind teeth over the competitive grinders. Screens are fine 190 microns.