... ~3.1MPa 4.Fin space:1.2~3.5mm 5.Tube Diameter:7, 7.94, 9.52, 12.75, 15.88 ... you package design,if you have special demand,if not,we will provide an individual package for you. Payment terms:T/T ... products as per customized samples or drawing.14.producing procedure: tube bending, punching fin, expanding, digressing, dryingWelding, leakage test, bending, inspection ...