pls tell me what sizse before purchase 

Attention : because many buyer don't leave what size he like , if don't leave it ,so defaulty we will send you 48mm .

Feature:
35/38/48/50mm fitting, easy install, durable.
High flow air filter with 45 degree angled neck and removable splash proof cover for pit bikes, scooters, motorcycles and quads.
Jubilee clip and rubber included.
Built to strict quality control standards.
Tested prior to leaving the factory.

Specification:
Condition: New
Color: Black
Size: 35mm/38mm/48mm/50mm
(Please let us know the size you’d like. You can leave the message on your Paypal note or Email to tell us.)

Fitment:
Universal Fit for 50cc 110cc 125cc 140cc motorcycle, ATV pit dirt bike etc.

Package Included:
1 x Air Filter