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The metals are non-allergenic and are very durable. Some people prefer a metal frame over plastic because the metal material looks better aesthetically. For some wearers the choice of a metal frame may be due to function rather than appearance.carrera sunglasses People who have a low nose bridge or a small nose may find it hard to buy plastic frames because they might not sit on the bridge properly. On these Carrera 13 sunglasses, the nose pads can be adjusted to accommodate the wearer?ˉs face shape. This is something that plastic frames cannot do however some plastic frames can be fitted with nose pads.