4MM OD X 3MM ID X 6 METERRefrigeration tube outer dia is 4mm / 5/32', inner dia is 3mm / 1/8', total length is 19.5Ft/6m long HIGH REFRIGERATION EFFICIENCYGood heat dissipation and refrigeration capability,high strength at low temperature.Copper tubes are hollow,so has strong heat transfer capability.If you need refrigeration for refrigerators, freezers, air conditioners, this is a good choice COPPER MATERIALCopper refrigerator tube has the features of high temperature resistance, corrosion resistance, oxidation resistance, durability, long service life SOFT & SHAPE CHANGEABLEBecause refrigeration copper pipe can bend and deform, they can often be made into elbows and joints. Smooth bending allows copper tubes to bend at any angle WIDELY APPLICATIONRefrigerator Tubing is not only used for refrigerator, freezer and air conditioner as refrigeration tubing coil, but also used as a HVAC system pipe.