Air Filter Cleaner Fit for Honda CB 250, CM 250 Twister 2016-2020 17211-K31-900 GenericFeatures: High Air Flow with Excellent Filtration. Environmentally Friendly. Designed to Increase Horsepower and Acceleration. Washable and Reusable. They offer bigger air flow, with almost 99% filtering efficiency. Lasts up to 50,000 miles before cleaning is required depending on driving conditions. No need to change carburetor jets or settings. Top quality powerflow filtering media. This is an aftermarket part, not orignal. Their drop in design