Brand: NITRA Item: Tubing Operating Temperature: -454 to +500 deg F Material: PTFE Color: Natural Inside Diameter: 6mm Outside Diameter: 5/16in (8mm) Operating Pressure: 138 psi Working Fluid: Air or inert gas Working Length: 100ft package NITRA pneumatic tubing, PTFE, natural, 5/16in (8mm) outside diameter, 6mm inside diameter, 100ft package.