This is a Performance K N Style Cone Air Filter with a Rubberneck Coupler (Air Filter manufactured in chrome housing and comes with a blue film protection that needs to be peeled off before use) Fits most carburetors requiring a 58mm (2.28in) inside diameter opening Designed for small engines 49cc-80cc 2-strokes ATV Dirt Pit Motorized Motorcycle Bicycle Pocket Bike Scooter Moped Go-Kart