Polycarbonate is also used for nonprescription shields, where the lenses and frame are molded in one unit. It is also the material used in the type of sports frames held on with elastic straps. In combination with polycarbonate lenses, this material offers optimum impact resistance and eye protection. This material can not be adjusted very well. Carbon fiber - This material is made by weaving carbon fibers and nylon togther and while this creates a thin very strong material, it is not very adjustable.
Carbon fiber does have a very distinct look and feel to it.
Check out the Bugz soft touch line to see an example of this. Co-Polymide is available in a wide range of colors. It is resistant to chemical damage, and is hypo-allergenic, however it is also somewhat resistant to adjustments. Barrel - The most commonly used type of hinge. Interlocking pieces found on the inside face of the frame are kept together with a small screw.