The Frankford Arsenal Quick-n-EZ Case Tumbler provides a quick and easy means to cleaning your brass. Used in conjunction with Frankford Arsenal Walnut or Corn Cob Medias, the Quick-n-EZ Case Tumbler removes fouling, lube and oxidation quickly and conveniently. The Frankford Arsenal Quick-n-EZ Case Tumbler will hold up to 600 9mm or 350 .223 cases.