Fresh Headies SKM4 Dry Sift Screen Set - Medium 12 inch x 24 inch - 4 Screens Four (4) monofilament polyester screens 26 inch x 12 inch x 2 inch Top Screen: 250 Micron / 60 Lines per inch 2nd Screen: 165 Micron / 90 Lines per inch 3rd Screen: 149 Micron / 110 Lines per inch Bottom Screen: 75 Micron / 200 Lines per inch