how many size lenses are there!!!!!!!!

Tech Specs:

Frame:

O Matter, 

Hinge:

nylon, 

Lens:

plutonite 

Interchangeable Lens:

yes, not included 

Polarized:

no 

Nose Pads:

yes 

Temple Pads:

yes 

Recommended Use:

biking, running, training, sessions, anytime you want music 

Manufacturer Warranty:

1 year