Copper Exhaust GasketThese copper gaskets are made to ensure no blow outs or ripping of your exhaust gasket as well as allowing you to re-use them after taking down your motor. Please only buy this product if you are familiar with your engine and your requirements as to what you need and what you’re running.Copper .040" exhaust gasket for Zenoah and Chung Yang RC engines. Fits stock mufflers and aftermarket pipes. This heavy-duty gasket is reuseable and helps resist leaking and blowout.