As anyone who owns one of the air fryers (or the combination machines), they can get messy depending on what you are making in them. I have the original Ninja foodie combination grill, air-fryer, oven, etc, and tend to use the air fryer function the most. Depending on what I am making, it can collect a lot of grease in the bottom, even when air frying, so I got these to make clean-up a bit easier. Basically, you let the unit pre-heat like normal, then you put this in the basket and put your food in. They are not really sturdy enough to put the food in first and then put the combination of the food and the liner into the machine without risking spilling. It will definitely work better for larger items like chicken breasts, or a bunch of fries that can be pretty evenly distributed throughout the liner. This will help to keep the liner held down and not curl up during the cooking process. Things like meatballs, however, if you are just doing a few of them, will not hold the liner down well and the sides will curl up as it gets hot, which makes it a bit harder to get the food out at the end. You do have to be a bit careful taking the liners out so you do not spill any grease that has collected as you bring it to the trash can, but overall, they do work and definitely help keep your machine cleaner so you do not have to wash it as much.I use my air fryer for cooking everything! Cleaning the fryer was always an unwelcome chore for me. I was thrilled to hear about fryer liners. I could not wait to order some. The price was very reasonable. I am happy. Clean-up is as easy as throwing the liner away.I use these air fryer liners for almost everything in the air fryer. Easy to use and fryer stays clean. I recommend.Works great with food in it. Would not recommend putting it in the air fryer during a preheat. Liners will blow around and start to burn in an empty air fryer. Could be deeper. Hard to get good out when making multiple batches without dumping the crumbs in the air fryer, which avoiding that is the entire purpose of the liner.Love these they keep the air fryer clean, when cool I just wipe it out.I love my air fryer but hate cleaning it. These things are awesome, easy to use and while it doesn't keep all mess out of the air fryer it is much easier to clean.greatEl producto es bueno, practico de usar, parece que ayudara a que lo que pones a asar tenga mejor sabor, pero hay momentos en que filtra y pasa algo de grasa a la air fryer.