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A properly sized band that is put on correctly should not her her, and will not break foot feathers. For silkies, a size 9 is best, although on a larger male, one size up would also work. I did have one bird with a very wide metal band that I felt was probably uncomfortable because of the width, and removed it. I've hears a few express concern about wing bands being painful, but in my mind it would seem like a pierced ear--painful to happen, but once it is over, no pain. That said, I haven't used wing bands.
If your birds are more than a month of two, they are too old for seamless bands. I don't think that metal bands are any more permanent than plastic ones; I've removed both from my birds on occasion with no difficulty. That said, I generally do not remove bands once I place them on the bird.