Inner Diameter:48mm Also fit for most motorcycle air filter with 48mm/49mm/50mm engine inlet For Honda Yamaha Suzuki Kawasaki Ninja300 250r ATV Quad Scooter Moped Dirt Pit Bike 3 Months warranty; if you don’t satisfy with our product,you can return it or ask for send a replacement. Product description Color:Silver Universal Motorcycle 48mm to 50mm Air Filter Cleaner Pod Style for Honda Yamaha Suzuki Kawasaki Ninja300 250r ATV Quad Scooter Moped Dirt Pit Bike