Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: What volume are the cups?
Document: Do not trust what the manufacturer states on the box! I purchased these and measured the cups myself. False Advertising!! !
Nice, thick silicone walls. I have not used these, but am satisfied with the thickness of the walls, and the size of the cups.
I am very impressed with these large muffin cups, and I highly recommend them. They clean (by hand) very easily.
We've had these muffin cups for a while and use them often. They work well and really make it easy to bake and clean up.
These are a wonderful alternative to conventional baking tins. Just put the dough in the cups, set them on a cookie sheet and pop them in the oven.
These Casabella Muffin Cups work so much better than paper cups because the batter mix does not stick and they are easily washed after use.
Silicone muffin cups are very forgiving, espescially outdoor cooking using a dutch oven. Get some now. They have other uses too. Potholder perhaps.
My sister wanted extra large silicone baking cups that she couldn't find in Norway. These are colorful and fun and definitely met her needs.
I researched well and these giant cups are perfect for bento lunches. My workmate envied them so much, she bought a set as well!
These muffin cups get used weekly....often for things other than muffins. Easy to use and easy to clean. These are useful for many things.
Answer: Filled to the brim one holds just a little less than one cup as measured in a pyrex glass one cup measuring cup.I hope this helps you.  They are big enough to make a nice jumbo muffin.