This is a pair of glasses. The lenses are attached on the frame by small screws. I also upload the lenses as template.The *base curve* of the lenses is 6. Update (18 Dec 2017)! I updated the files. Now, there are hinges to assemble the temples to the frame. You can use filament (1.75mm) as a pin for the hinge. I leave the original stl files in case someone wants to use metallic hardware.