Twin Air filters are designed to increase airflow while ensuring the highest level of protection from dirt/dust. Design, high quality materials and superior construction deliver unbeatable performance and protection. For Yamaha YZ 250 F (2014-2018), YZ 250 FX (2015-2017), WR 250 F (2015-2019), YZ 450 F (2014-2017), WR 450 F (2016-2018).