Certified for use up to 240 degrees

A few recommendations when using - 

Use oven mitts - It may sound obvious, but the dish gets very hot
Preheat Oven before use
Best to avoid drastic temperature swings when using.  For example:
Do not put a hot dish straight from the hot oven into a sink full of water!
Do not put a cold dish into the hot oven or microwave!
Do not put a hot dish on a cold countertop!
Do not wipe a hot dish with a cold wet cloth!

Do not put pottery on direct heat source such as:
Do not put directly on gas or electric hob.

A little more information...

Bolesławiec pottery is the collective term for fine pottery and stoneware produced in the town of Bolesławiec, in south-western Poland.

The art originated in the late Middle Ages, but it fully developed in the 19th century and has continued ever since. The pottery is collectively known as "Polish stoneware", as it became one of Poland's unofficial cultural symbols. The durable and functional creamy white and blue stoneware pieces are unique and easily identifiable. Ceramics and pottery are a definitive part of the identity of the city of Bolesławiec (Bunzlau). The town itself is often called Miasto Ceramiki (Town of Ceramics).  The ceramics there have been produced there for over a thousand years.

The geography lends itself to ceramic work as the area is rich in natural clay deposits; the clay is still excavated today. The clay is plentiful and of extremely high quality. It has a high feldspar and silicon content, and is classified as stoneware after firing. It is fired at extremely high temperatures, around 1100-1300 degrees Celsius. The clay is brown to grey in color, and rough in texture compared to finer claybodies such as porcelain.  Stoneware is sturdy and vitreous to semi-vitreous and porous when fired. Glaze can be applied and the piece can be re-fired to create a watertight surface.

^{Polish Pottery is hand crafted with pride at many small manufacturing companies in Boleslawiec, Poland. All of the pieces are hand painted, using sponge stamp and brushes to paint the art on each piece. All of the patterns are hand-cut by the artists in the sponge and then they use the sponges and brushes to apply the unique pattern to each piece. Sponges are used because they keep the paint wet for a long time, allowing the artist to slowly go around one piece at a time, stamping a unique specific pattern. Several of the artists will create the initial pattern and hand paint a pattern, so all of the artists know what each pattern will be and can keep a similar style to the completed pieces}