Product Detail 1) Premium Herb Spice Grinder 2) Ultra-Strong Magnetic Lid Top 3) Built-In Dust Catcher (Inside) 4) Heavy-Duty Burr Cutting Teeth 5) Manual Twist Grinding Process 6) Aircraft-Grade Aluminum Construction Grinders’ are made from aircraft-grade aluminum, so you get the perfect grind and smoothest smoke. With a lifetime guarantee on our grinder teeth, you’ll expect the best quality product on the market, and we are determined to deliver. Ultrasonically cleaned, our grinders are completely safe and healthy to use. A lot of grinders have machine oil residue or are just dirty. We ultrasonically clean each and every grinder to ensure a perfectly clean grinder before the customer receives it.