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Metal frames are better than plastic and polycarbonate frames in many situations. Metals come in a variety of types, from base metals to titanium, aluminum, and stainless steel. Metals are light, thin, and non-corrosive. They are good for many different types of working environments, and can help decrease the weight in sunglasses with glass lenses. They also can look extremely stylish, and come in a wide variety of shapes and styles.