4 Piece Herb Grinder by VA - Green Hard Top 2.5" Herb Grinder, Spice or Tobacco Pollen, Grinder Made from Aircraft Grade Aluminum with Pollen Collector! Best Consistency & Best Quality A couple of things come to mind while using this herb grinder. First is just amazing! Two is how perfect is this!. Either grinding Tobacco or your favorite herb you will have perfect uniformity every time. Worried about your favorite parts of whatever your grinding might be lost. No worries here with the stainless steel pollen screen allows for only the finest pollen to fall to the bottom catch. We use only the best quality aluminum and thats Aircraft Grade Aluminum with the newest in CNC machining technology. We figure fighter jets can use it why can't our grinders. Not to be worried, your backed by a lifetime warranty with this product. If this herb grinder is not up to your standards contact us and we will return it. We stand by our product with a 110% life time warranty! How sharp are the blades? Razor sharp Diamond Cutting Blades for extreme efficiency and a perfect cut every time. We often compare it to a Hattori Hanzo sword from pulp fiction.