Smooth connection between flange and pipes Material:304 Stainless Steel  With or without heat shield  Flange thickness we used are 10mm,12mm and 15mm The deformation coefficient of the flange surface within 0.5mm TIG weld make sure the firmness and gilding surface Catted or catless Exhaust bellows use crochet net transverse,reducing vibrate frequency Beautiful surface finish,polish or brush