I bought these because they are bigger, softer and more flexible than the little hard plastic ones everyone else sells. They will get hot after a few minutes depending on the type of mask you are wearing. In my opinion, they go very well with 100% cotton masks. There is a little order when you first open the package but I love it, it smells like a fruity scented eraser I collected as a kid. The smell will disappear after one use, or I'm sure you can wash it off.
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