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In the early stage, the main materials of the frame were metal and tortoiseshell, including stainless steel, titanium metal, platinum, plastic, Monel, nickel alloy and other materials. The mirror frame made of titanium metal is lighter and more corrosion resistant, which can avoid losing luster due to the corrosion of sweat on the metal during long-term wear.
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Taizhou Youto Glasses Co., Ltd.