This is a well made cup that attaches to the side of a wire cage. The cup and holder are made of thick plastic. The transparent lid of the mug is not removable. I bought all three sizes of these mugs: small, medium and large (I have shown the mugs next to the glass in the pictures so you can see the approximate size of each mug). I have a medium sized parrot and a few tiny Seram chicks, so medium to large cups work best for my purposes. Personally, I'd prefer that the small cup didn't have a round bracket attached, or that the perch was removable (it's not). The bracket that attaches the cup to the side of the cage works very well and keeps it secure (while being easy to remove). These cups are a little deep and I would have liked them to be smaller (birds eat at the top, drop food back into the jar and rarely reach the food at the bottom). These cups generate less waste than open-topped cups. I recommend these cage mugs as they are well made and very affordable! Please note if my review was helpful to you. Thanks very much!
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