I had old feeders, the flower openings just softened and broke. They work great in most feeders. Some feeders are nice and tight and some are a little loose. Not loose enough to fall out but just wanted to mention it. Also the reason for only 4 stars is that they have a sharp thread on almost every one of the rubber parts where it was probably attached to a larger set during the molding process and cut off to make singles. No big deal, I just cut any sharp strings off the rubber pieces to make them smooth. I didn't want it to harm the birds - I wasn't even sure what it would be, but I wanted to be sure.
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