Aprilia RSV4 Factory and RSV4-R Left Hand Side Engine Case Cover. These exciting new Engine Case Covers have been developed in collaboration with selected race teams and crash tested within the R&G Racing Suzuki GSX-R Trophy. Crafted from 4mm polypropylene for strength, durability and good looks, they complement our crash protectors perfectly. The covers simply bolt on over the original engine casing so no messing with glue or removing anything. Slimline for maximum ground clearance, ultra lightweight, matt finish and protecting one of the most vulnerable parts of the machine, these could save you £'s in the event of an accident ... Ever seen the prices of a new engine casing or the cost of removing debris from your engine? Made in the U.K.