Ready-to-Use Air Filters are made of fused dual-stage, open-cell foam. Open pore outer foam layer allows for maximum airflow, while the more dense inner layer foam ensures filtering protection from dirt, fine sand and dust. Dual-stage design resists filter plugging and airflow blockage. Pre-oiled with Maxima FFT – the world’s best and most effective air filter oil. Packaged ready-to-use. Our RTU filters are available at your local ProFilter or Maxima dealer! No dealer near you? No problem. Just find the right filter for your ride using the Application Chart below, and purchase your choice of filter from profilter.com!