Originally Posted by Metsman

Hi Havoc. I found this description on line. It says it much better than I can:

Elegant airlock sunglasses frames Come in 3 colors. 720/18S model represents style, quality and performance of Airlock brand.

Frame specification:
720/18S model of Airlock come with non-prescription lenses, but can be made into prescription glasses (with Rx lenses) or sunglasses. You may also install prescription sun lenses or even Sunsensitive - Transitions lenses.

Available colors
Bronze w/Tan/Silvertone Gradient Mirror Lenses
Java W/ Brn Prpl Dbl Gradient Lenses
Burgundy W/ Coral/Silver Gradient Mirror Lenses

Available sizes
49 - 49 - 140