Material: High-Quality Polyethylene - Our Polyethylene Conduit Tubing is almost twice the density of our nearest competitor. Guaranteed to outlast and outperform any other Polyethylene Conduit Tubing being sold today. Flexible Ribbed Tube Design allows for a clean and easy install Resistant to abrasions, gasoline, oil, and other harmful chemicals Ideal for a wide range of applications: automotive, marine, industrial, office, home, etc. Operating range of -40 to 200?F (-40?C to 93?C) Sizes are measured by the inner diameter