The lids are sold individually in 9x6 and 9x13 rectangular sizes and a 9x9 square. You can also buy a set with the 9x6 and 9x9 lids.
These are a similar weight as the larger round lids. While they don't stick to or stretch around pans, they're heavy enough to stay in place if you set them on top of your pan. And if the pan's surface is smooth and you press down a bit, you create suction that keeps the lid attached to the pan.
Needless to say, if you've got rising bread dough in a pan, you won't get that suction. What you get is a lid that allows the extra gas to escape but it's still heavy enough to seal again, unlike plastic wrap that just flaps in the breeze if it comes loose.
They're dishwasher safe, so they're easy to clean, and GIR makes their products in a pretty wide range of colors, so you can match your kitchen, choose your favorite color, or just go random.
What would you do with these?
Who's it for: People who need lids for things that don't have their own lids.
Pros: Dishwasher safe. Heat resistant.
Cons: Now that they've added the rectangular sizes, I'm a happy camper.
Wishes: None, really. I think they chose useful sizes.
Source: I received this from the manufacturer for the purpose of a review.