BUICK exhaust seal rings: 1.Material: Stainless steel/Iron 2.Certificate:TS16949 3.All OEM can be supplied here BUICK exhaust seal rings:1.Material: They can be iron+mica,stainless steel+mica, graphite,ceramics or others.2.We mainly supply seal exhausts used to auto cars, cylinders, caterpillers and so on.3.Seal ring, exhaust pipe.Welcome to contact us if you have any inquiry.