GOOFIT 38mm Air Filter for GY6 CG 150 Moped Scooter ATV Dirt Bike Air intake diameter is 38mm or 1.5'' Outter diameter:58mm or 2.28'' Fit for GY6 CG 150 Moped Scooter ATV Dirt Bike Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)