DDM SLAMMER DAMN ENGINE PROTECTORSlammerRC Engine Damn for Zenoah and Chung Yang engines. Primarily designed for the 1/5 scale HPI Baja 5B, these SlammerRC Engine Damns will fit many Zenoah and Chung Yang engines used in RC cars, trucks, scooters and pocketbikes. Not designed for the Reed Induction Crankcase. Protect your engine, keep grass & rocks out of your engine cooling system! Each "slammer damn" is made of Polypropylene(PP). The Polypropylene has a melt temperature of 363ºF. Hole size is .125"x.150" Thickness .038" Nominal open area is 58% Includes slammer damn, 2 plastic ties, and sticker. Installation instructions can be found here: http://slammerrc.com/enginedamn.html