... 3", 4" Size customized Metal Pall Ring:Carbon Steel pall ring, CS pall ring, Carbon Steel pall ring, Stainless steel pall ring, SS304 pall ring ... Stripping, Heat Recovery, ExtractionMaterial: Stainless steel, carbon steel, aluminum, bronze, 304L, 316L, and other alloy.Technical data of metal pall ring: Diameter (mm) ... .8/2.074/350.965/.95550/531200370/371 Carbon Steel, Stainless steel Metal Pall Ring