It is made of acrylic,called watch display

 Elegance and fashion design Acrylic counter for cosmetic/exquisite products or others.(Acrylic resembles glass but is many times stronger than glass, more impact resistant and therefore safer. Acrylic offers exceptional optical properties, Crystal clear, like Crystal, enjoying the reputation of "queen of plastic", uniform thickness and low stress level, superior weather resistance and half the weight of glass. )