The windowpane oyster, window shell, or jingle shell is a bivalve marine mollusk in the family of Placunidae. It is edible, but valued more for its shell. The oyster's shells have been used for thousands of years as a glass substitute because of their durability and translucence. More recently, they have been used in the manufacture of decorative items such as chandeliers and lampshades. In the Philippines, the shell is known as the capiz shell (kapis). Capiz shells are also used as raw materials for glue, chalk and varnish.