K&N Air Filter for Honda CN250 Helix Scooters SPECIFICATIONS: Product Style: Round Tapered Universal Air Filter Base Outside Diameter: 4.25 in (108 mm) Flange Inside Diameter: 2 in (51 mm) Flange Length: 0.875 in (22 mm) Flange Type: Centered Height: 3.406 in (87 mm) Top Outside Diameter: 3.5 in (89 mm) Top Style: Metal Top Material/Finish: Black Oxide Filter Re-Oiling Amount: 0.31 oz (9 ml) Weight: 1.2 lb (0.6 kg) Washable Reusable COMPATIBILITY: Honda CN250 Helix ’86-87, ’92-01, ’04-07