Plastic, not a very good thing. Flattens when tightened. If the air filter is not tightened and tightened, it will wobble on the carburetor, causing the carburetor bolts to loosen. I'm throwing everything away and crossing Mr. Gasket off my list of parts sellers.
π§ Bapmic Engine Valve Cover with Gaskets & Bolts for BMW E82 E90 E70 128i 328i 528i X3 X5 Z4 (Part Number 11127552281)
9 Review
πͺ FEL-PRO VS 50569 R Valve Cover Gasket Set: Superior Performance and Durability
9 Review
π§ FEL-PRO VS 50561 R Valve Cover Gasket Set: Superior Quality and Durability for Optimal Engine Performance
9 Review
RKX Vacuum Reseal Rebuild Gasket Replacement Parts
9 Review