It can draw more air into your engine, improve throttle response and more horsepower. The fine mesh increases the amount of air flow, straightens the flow and stop sucking hot air from high temperature engine compartment. Get instant horsepower by improving the filtering process. Washable and reusable. Easy to install and use. Name:Air Filter Colour:Black Material:Aluminum alloy Type:Air Intake Filter Model Name:Air Cleaner Intake Filter Item Type:Air Filters & Systems Shape:Round Tapered size:Air filter Mounting Holder inner diameter : 42MM Fit:For 47/49cc pocket bike mini dirt bike. Features: This is a great kit to upgrade the stock air filter of your 47/49cc pocket bike mini dirt bike. The performance air filter is for high flow racing. Package Contents: 1*Air Filter 1*Mounting Holder 2*Screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.