1. The air filter prevents abrasive particulate matter from entering the engine; cylinders to ultimately increase horsepower, torque and improve the gas mileage. 2. Made of high quality materials, the air filter is durable in use for a long time. 3. Comes with clamp and flush rubber adapters for easy use and adjusting. 4. Easy to fit, can be secured tightly onto your vehicle pipe, and you can adjust to the size required with flat head screwdriver. 5. Fits for most Off-road Motorcycle ATV Quad Dirt Pit Bike. 6. Material: metal, non-woven, plastic 7. Size: 35mm/42mm/48mm/50mm