Aeroflow Air Filters are designed with excellent filtration in mind, all the while increasing performance! Originally designed for performance minded racers, these re-usable filters are manufactured from high quality cotton, pre-oiled for outstanding dust retention and are washable. We have the newest technologies in air filter manufacturing that allows us to provide you with what we feel is the highest quality filter at a great price. Engineered for performance and durability on the street or track, you will NEVER NEED ANOTHER AIR FILTER EVER AGAIN. Chrome-plated or black finish with reusable/washable cotton elements. Aeroflow air filter assemblies work with all popular standard 4150 (5-1/8" / 130mm) carburettors.