Currently it is made of tempered soda-lime-silicate glass in the US[1] and borosilicate in Japan[2] Fire-King was originally produced in the 1940s for everyday use, rather than display.
The vintage nesting bowls, produced by the Anchor Hocking Company, are one of the most sought after collectible dishes of this type.
[2] Officially opening to the public in 2011 in Tokyo, Japan, the company sells a variety of mugs and other dishes in various colors such as milk glass, jade-ite, and rose-ite.
The Fire-King line includes bowls, casseroles, cups, plates, serving platters, creamers, vases and more.
There are many decaled patterns that are very popular including Blue Mosaic, Wheat, Primrose, Fleurette, Forget Me Not and Anniversary Rose.