MadMax Copper Exhaust Gasket Fits All 23cc-30.5cc Zenoah, CY Rovan, RCMK Engines MadMax Copper Exhaust Gasket Great upgrade over the stock paper style gaskets. All 23cc-30.5cc Zenoah, CY, Rovan, RCMK, and other 1/5 Scale RC Gas Engines Fits many RC Cars like HPI Baja, LOSI 5IVE T, DBXL, Redcat, FG etc...