Upgraded air filter to increase performance by allowing your engine to breath easier. Hard wearing alloy filter housing with secondary top metal filter and small thin air flow holes to catch larger bits of dirt, mud and sand. This filter is designed more for off roading. Includes spare air filter sponge. To fit engines carbs 8-11mm outer diameter. Includes cable to ties to secure. Will stretch slightly to fit 12mm carbs. Images copyrighted by BlackSmith Products Ltd.