These silicone mats are used for flattening membranes against the glass surface on the Odyssey DLx, Odyssey M, Odyssey CLx or Odyssey Classic Infrared Imaging System. The mats come in three sizes: 25 cm x 25 cm, 13 cm x 13 cm, and 19 cm x 26 cm. The 19 cm x 26 cm size is specific for the Odyssey M Imager.