This is a rare celluloid glasses! Celluloid is a material that gradually conforms to your face depending on your body temperature. Designed to give you years of enjoyment of changing the heavy pressure of this frame. Note: Because it is a material that is weak to alcohol, it cannot be used with alcohol. The frame uses celluloid material will burn at approximately 366°F (170°C), so do not place it near a fire such as a stove. The famous Haruo Saku. The "Meihin Haruo Saku" is carefully crafted from a celluloid frame that features a 7 hinges and features a beautiful temples. Only made by skilled hands. This is a masterpiece of tradition. Fukui Glasses Co. Ltd.