Ramair RT twin carb air filters, which feature a fully rigid air filter and baseplate to mount onto the specified carb below. They are constructed using stainless steel cage internal and our famous twin layer foam on the outside. Our baseplates are precision cut from aluminium and mount to the air filter using quick release push clips, supplied with the filter. Over the years many of our competitors have unsuccessfully tried to replicate our RS range of air filter, for more than 30 years though we've been getting it right from the start.