This 55mm 4 piece blue grinder is made from aircraft grade aluminum rod using the newest in CNC machining technology and is anodized for a smooth finish; this means no wear or smudge marks. Razor sharp blades make for extreme efficiency. It has a stainless steel pollen screen which allows for only the finest pollen to fall through to the bottom catch. Powerful neodymium magnets ensure incredible closure while the thin poly ring around the top grinding section enables smooth grinding and no friction. Comes with protective pouch and pollen scraper!