NEWON3 PACK, Clip on Flip up Polarized Lens For Prescription Glasses, UV Protection Sunglasses Over RX Eyeglasses

Its glass or plastic? will fits with oakley currency or rayban wayfarer

Are the lens shiny like a mirror?

Are the clamp arm (clips) distracting? As in you can still see them when they are clipped on? Or are they barely noticeable?

Does the mirrored finished easily rub off after a short while (about a year to a year and a half) like with silver mirrored sunglasses / flip-ups?