PTFE Teflon Tubing PTFE (PTFE Teflon Hose Heat Resistant) Very Lubricious - the lowest coefficient of friction of any polymer. Inner Diameter x Outer diameter: 4mm x 2mm, 6mm x 4mm, 8mm x 6mm, 10mm x 8mm, 12mm x 10mm, 14mm x 10mm, 14mm x 12mm, 25mm x 19mm and 25mm x 21mm Working Temperature range 500 ° F ( 260 ° C) to -454 ° F (270 ° C). * Excellent flexibility * Good chemical resistant PTFE tube * Weather resistant and suitable for outdoor use * Low friction * Non-stick Tubing