Size. Inner Diameter: 5.5mm (7/32 Inch); Outer Diameter: 8mm (5/16 Inch); Length: 3 Meter (9.8 Feet) Linear low density polyethylene hard tubing, lightweight It is highly resistant to stress cracking from chemicals and aging Note: This polyethylene tubing may not be used with food products or drinking applications Applications: Pneumatic tools, pneumatic piping, drain lines, instrumentation, chemical transfer, process control, laboratories