If you're unsure which o ring is best for your glasses, please feel free to email me - theframegameau@gmail.com
5mm Information
IF YOUR GLASSES ARE ULTRA SKINNY WITH A WIDE END, THE SMALLEST 5MM O RINGS WILL NOT BE ABLE TO STRETCH OVER THE END IF IT IS GREATER THAN 6MM AND FIT THE SKINNY ARM - if the arm is tapered and 6mm or less then you might be able to slide it on if you go slowly ** see video below for how to **

If this sounds like your glasses, we can either size up the o ring, use a normal glasses chain attachment instead, OR you can take the legs off the glasses frame and slide on the o ring from the other side :)

This is the screw you would unscrew if you needed to take off your sides in order to fit a 5mm - if your glasses are springy (bend outwards beyond frame via springs) I would advise against this method

Size Guide
You can measure the side of your glasses with a ruler to determine which size you will need
How to use a tool to slide 5/6mm onto flared glasses
