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

Input:
Question: Are the cup sides straight (up and down) or graduated (bottom smaller diameter/top wider diameter)?
Document: The Bellemain 12-cup muffin pan is made of a high-quality silicone and is much sturdier than the cheap ones that I have seen. The rim is even double-reinforced so that it can be picked up when filled if necessary, although it is always better to use a baking sheet to handle silicone bakeware. The cups are standard size, with inside dimensions of 2 3/4 in. at the top tapering down to 2 in. at the bottom.
Once out of the oven don't let the muffin pan stay on the hot cooking sheet. If over time food should start to stick use a very small amount of high quality oil on the bottom and sides.You're going to love cooking with this pan!
This 12 Cup muffin pan has done a wonderful job baking for us. It is made of a thicker, sturdy silicone that washes up easily and even better, allows for cooking muffins without a paper cup inside. I sprayed it lightly with cooking spray which made getting the batter in even easier since it slid off the top and into the cups.
This is the most amazing pan I have purchased. Nice thick silicone holds the muffin shape perfectly. Cleaning is a breeze either by hand or dishwasher. Definitely need a cookie sheet underneath to make a stable entrance and exit from the oven. I cannot believe it took me so long to buy this. I even made little cheesecakes in it and they came out perfectly- no sticking to the sides, nothing - just popped right out with a little push on the bottom. HIGHLY RECOMMEND!
Muffins pop right out. I have been making egg muffins for my breakfast. I just have to plush up on the bottom and they fall right out
Muffins pop out so easily because you can push up from the bottom. Cleans ok in the dishwasher but left with white water spots. May just be an issue with our dishwasher.
Love using this pan for egg muffins. Does a great job of getting a clean cupcake shape with minimal clean up. I would recommend putting the pan on top of a flat hard pan before trying to put it in the oven...don't make the same mistake I did and spill your eggs with the flimsy silicone!
I got this for my husband for christmas, because he likes to bake (and eat) muffins. At first, he had a lot of trouble using it, especially getting it in and out of the oven, because of the lack of rigidity. He solved that by setting the muffin pan on top of a wire rack, and now loves it. Much easier to get muffins out than a regular baking dish, and so much easier to clean.
This was my first, and probably last silicone muffin pan. You have to use a LOT of oil, and even then you often have the issue of muffins sticking to the pan. It is also very difficult to clean... much more difficult than metal muffin pans. By the very giving nature of the silicone, it is nearly impossible to get a rag into the edge at the bottom where food likes to adhere.
Pretty sweet for a cup cake pan. The cakes are easy to get out of this thing too which is awesome.
Answer: They are graduated from 2.75" down to 2".