The BMC Air Filters Motorcycle Replacement Filters FM236/04 are high-performance air filters designed specifically for motorcycles. These filters are made with multi-layer cotton gauze and are treated with a special oil to provide maximum filtration and airflow. They are designed to replace the stock air filter in a motorcycle's air box, providing improved engine performance and protection. The FM236/04 filters are washable and reusable, making them a cost-effective and environmentally friendly choice. They are compatible with a wide range of motorcycle models and are a popular choice among riders looking to upgrade their air filtration system.