HIFROM TM 38mm 45 Degree Angled Double Foam Air Filter for 90cc 110cc 125cc 140cc 4 Stroke ATV Pit Dirt Bike 1. 37mm-39mm fitting. 2. Has 2 layers of foam, a thinner outer later and a thicker inner layer. 3. Angled connection for tight fitting areas. 4. Fits 90cc, 110cc, 125cc & 140cc 4-stroke bikes. 5. Fits most Chinese import Pit / Dirt bikes.