... take the most advance technology in copper process, Rolling-Casting. Inner-grooved Copper Tube is of high cleanliness and ... no pin holeStandardAISI, ASTM, BS, DIN, JIS, ENMaterialRed copper, brass copper, and so onOutside Diameter4mm~60mmWall Thickness0.25mm~5.0mmLengthas ... your deposit or coping of L/CPayment Terms L/C, T/TPriceUpon negotiationProductivity2000 MT/monthQualityHigh Quality. Our products ...