Careful as in, don't yank it when you stretch it/stretch it too much. I've also found the type that are made of rubber band material are more durable, as well as the rainbow-loom type (whatever they're made of). But
this type that are very thin-- don't know what they're made of, not sure how to describe them except that they're quite thin, not as in narrow but markedly "flatter" than the other type, and also a more smooth/shiny type of elastic-- tend to break faster, in my experience, and they stretch out (which isn't a big deal; you'll just have to wrap them more times. This type also needs to be "broken in," as in, the first time you stretch it, it might feel like it's going to break, but really it's just loosening up).
I just like this small type because they're unobtrusive and not obvious (and you can get them in clear/black so they're pretty invisible, or in fun colors), and they stay in pretty well (for my hair, I find the "covered" elastics are too slippery and tend to come out; if I'm not wearing these small ones for security, it's usually a larger silicone type. Any kind that's even remotely slippery is going to slide right off the end of my braid{s}).
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