Copper tube, insulated for air conditioning, cooling and air conditioning, measures 1/4 3/8 inch and a length of 20 meters. Composition: CuDHP (Cu+Ag) > 99.90% Density: 0.015% / 0.040% Thermal insulation: efficient thermal conductivity at 10 oC: 0.41 W/HCm: efficient steam temperature at 190 °C