This is made of 'Cellulose Acetate'.  It is a material that has been used since before the development of plastics, and is a component made by coagulating ingredients extracted from plants rather than petroleum.
It has been mainly used to make accessories and eyeglass frames that are in contact with the skin for a long time, but in recent years, it has been even widely used in cosmetics.  In addition, it has a luxurious touch and beautiful color, which adds luxury and stylishness.
 
Simple & Chic