Hi flock808, Good day! We recommend changing on an as need basis. Daily change or more frequently if needed. Thanks,

NO...............It is a paper liner that is slightly rough on upside and smooth on bottom side.

I used them for liners for my conture and quaker. I think I might be hesitant to use these for your birds these have a cotton type liner and i would be afraid of them swallowing that material.

Hi taffatiffi, These are disposable. Thanks,

Good question. The photo iof the package says 7 CT. Petco should put that in the description.

These liners are 20 inches by 18 inches. Not sure of the dimensions of inside your tray or if you are like me and use cage liners (much larger different brand), I put the liners on top of the grate to keep that clean from my very large macaw. (These would be too small for my cage, unless I layered them, which I have to do already with the much larger ones I use!) Measure the area you will use them in and that will give you your answer. If using on top of the cage grate or without a grate, detrermine if your bird will tear the liners to shreds or not before using. You can use them going up the sides a couple inches to help contain food inside the cage, that's where layering them helps. I go up about 4 to  5 inches myself,, since I have such a large cage.  I'm unfamiliar with this brand and the quality of the paper, and if the paper has a waxy coating, but I use several layers and remove a layer as it gets soiled each day to make cleaning much easier.

Hi glaring, No need to add litter. Thank you,