Titanium and Daicel Acetate (Japan), higher quality and stability, excellent in heat resistance, stable against sunlight. Environmentally friendly resin made from cellulose obtained from wood and cotton. Built-in hinges and engraved Titanium rims, sharp angled design, Japanese high definition, high contrast lenses with oleophobic treatment and 8 layers of antireflective coating. Beta-Titanium temples. Made in Japan. Read Less