Most metal frames are made out of Monel. Monel has a copper and nickel base. This metal can be corrosion resistant, strong, and easily adjusted. It retains its stability and shape.This model features a Cat-Eye shape, with a Single Bridge.This model has silicone nose pads for comfort and easy adjustments.This frame features a spring hinge, which keeps its initial balance and adjustment, thereby avoiding the need for subsequent adjustments.
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