Motorcycle mufflers construction: Custom tapered and TIG welded 16-gauge steel canister with 1.76"I.D. slip joint end. TIG welded, stamped steel hanger bracket with Biltwell anvil marking. Gold zinc plated 16-gauge perforated steel baffle tube with stamped and TIG welded end caps. Fiberglass packing around removable internal baffle assembly provides additional sound muffling and inhibits sparks during backfiring. Two finishes available: Triple chrome plating or matte black high-temperature powdercoating.