It's really convenient because things like gratin, bread, and sweets don't stick when you bake them. I like the Cerabeake series and bought this, but it's unused because it was larger than I expected. It's not unopened, so please refrain from purchasing if you are concerned. This is a set of 2. Cerabeake Adelia Ishizuka Glass Ceramic Coating Heat-Resistant Glass 19.3 x 16.4 x 4.5cm, approx. 800ml Microwave safe / Oven safe (not for direct fire) / Freezer safe / Dishwasher safe / Oven toaster safe