Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Some of the other glass lids say their glass is tempered.  I don't see this in the description.  Are these tempered?
Document: These lids fit on the Anolon Nouvelle pans. The handles have a rubber grip which is wonderful and does not get hot. I like that they are glass so I can see how my creation is doing. For years I have not had and properly fitting lids for my fry pans so I decided to treat myself. Good decision on thses lids. Bonus for me is that I was able to throw away a ton of misfitting lids!
Gifted these to my mom and she likes them. I need a set but think they're out of stock...The silicon on handles works well, don't need potholders. I like the glass so you can see the food cooking, nice and heavy.
gift, pan lids are exciting so what can you say, gift was lovely, arrived in time, pan lids you can only say so muchl
I have neuropathy in my hands. I drop lids with knobs, but this works great. Call me silly, but I like to watch my food cook so glass lids are my favorite. I may have to check on other sizes.
These glass lids are good and fit quite well. Even they have metal edge, one has to be gentle handling them for the glass is bit thin. The handle is bit excessive, therefore harder to store. I use the 10 inch more often. I have two different 10 inch pans that are old. One has rounded edge at the top and measures 9 1/4 inch in diameter, the other is straight and measures 10 inches.
I bought these lids to go withAnolon Advanced Hard Anodized Nonstick 12-Inch Open French Skillet. The lid fits perfectly. The only "flaw" in my opinion is the metal rim. This metal edge helps make a tight fit on the skillet but gets hot during use. I am accustomed to glass lids remaining relatively cool. It was a short learning curve to aviod touching the hot metal. It would be nice to not have any metal and a redesigned shape could still seal tightly.
Perfect Lids for your Circulon 10&#34; and 12&#34; Infinite skillets! They fit perfect and being glass, let you view your cooking progress.
Bought these to use on my nouvelle copper skillets. They fit fine and do what they are supposed to. The glass is very clear as well (HA!). Would recommend to others.
The pot lids were exactly what I needed and in got them for a great price. Packaging was easy to open.
These are very nice lids, they have lasted a long time, and still look new. I like the insulated handles.
Answer: I don't know if they are tempered but I have dropped them once or twice each and they did not break.  Obviously they withstand high temperatures.  Both are still serving me well.