... aluminium parallel flat tube and round tube 3:sample can be avaiable Round tube Alloy: 1000 series, such as 1050, ... 1070. 3000 series,such as 3003,3102, 6000series,D97width 12~38mm higher 1mm~4mm used for air condition and condenser pipeAluminium condenser ... tubeFlat tubeAlloy: 1000 series, such as 1050,1100,1070. 3000 series,such as 3003, ...