High Performance Black Air Filter for Dirt Bike with Double Foam for 150cc 160cc Motorcycles Accessories available in 35mm, 38mm, 40mm, 42mm, 45mm and 48mm. There are 2 layers of foam, the outer layer is thinner and the inner layer is thicker. Fits most off-road/all-terrain vehicles and ATVs imported from China. Material: Plastic and foam