Aeroflow round air filter elements 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. These elements can be purchased separately along with bases and lids to create a full assembly. 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!