Teflon Sheet for Heating Press Transfer Machine 15x15 Inch 16x24 Inch (15x15 Inch) 15.7" x 15.7" (40x40cm) 0.06mm thickness 16.5" x 24.4" (42x62cm) 0.06mm thickness When heat pressing, Place the Teflon sheet on the substrate, which can prevent the heating mat from the the pollution of the image on the substrate. Teflon sheet is an integral part in heat pressing.