Available in 2.5, 3 and 3.5 inch diameter. Made from dead soft aluminum and helps conforms easily to surface irregularities and creates a tight leak proof seal. Will not shrink, deteriorate, blowout or burnout. Ideal for race, street, tow vehicles and motor homes. Note: Collector gaskets include mounting bolts. Product Features:Manufactured from dead soft aluminumConform to surface irregularitiesWill not shrink deteriorate blow out burn outIdeal for race street towing or motor homesInclude mounting hardware