Efficient Filtration: The double-layer sponge air filter provides high-flow air filtration, effectively prevents dust from entering the cylinder, improves intake efficiency, increases engine performance, and is an ideal choice for increasing power and speed. Widely Compatible: AVT air filter fits for 50cc, 70cc, 90cc, 110cc, 125cc motorcycles, go-karts, ATVs, dirt bikes, scooters and mini bikes with an interface diameter of 45mm. Easy Installation: The double foam sponge motorcycle air filter is easy to install and remove, adopts a double-layer sponge structure, is not easy to fall off, and has strong filtering capacity.