1. Size: Manifold intake: 30mm; The outer diameter connected to the air filter: 44mm 2. Fit model: 4-stroke 125cc-250cc, horizontal engine, cable choke 3. Our products are guaranteed to be of good quality and of good quality. 4. Package list: The goods you receive have a beautiful keychain in addition to the product itself. 5. Reminder/Note: To ensure that you purchase the correct product, please read the product description or the size of the picture carefully. Thank you for your attention.