They fit my not so small wrists comfortably. They stretch just enough to hold a ton of hair - big ponytail dreadlocks, for example. They are probably too big for children's hair unless they are unusually thick. I wash these bands in the washing machine with a small mesh bag and then reuse them. I haven't broken any yet. This bag should last me a very long time. I don't make my own face masks, but you could probably use them successfully as ear loops.
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