Kenke’s design provides two parts: a base with transparent lenses with a hooked clip-on. Hooks make this part easily removable, so switch it easily; many clip on are available@ kopajos.com. The nose pads are flexible. This frame also works for any optical prescription. Information sizes are: 43mm (lenses) 21mm (bridge) 140mm (arms) bought these beauties in Greece /Mykonos a few months ago ,barely worn, in great condition tell sell online for $290 new