This tubing meets the standards for NFE 49.100, has a length of 100 feet, a maximum operating pressure of 400 psi @ 68 Degrees F and is designed for the following applications: air. It is black, has an operating temperature of -4 Degrees F to 175 Degrees F and is resistant to chemical, humidity and is made of nylon. In addition, it has 6 mm outside diameter, 4 mm inside diameter, with a metric system of measurement, with 0.03 inch wall thickness, and Shore D 60 hardness.