Tube tech produces corrugated fin tubes with internal and external spiral corrugated copper fins of 0.5 mm to 1.2 mm height which creates progressive turbulence giving a high degree of thermal conductivity. These tubes are made from thin walled smooth tubes of wall thickness as low as 0.5 mm. These tubes are fabricated by using a special process where the outer and the inner surfaces are given spiral-shaped rotating impressions which equips corrugated tube with excellent thermal properties.