I have masks with elastic ear loops. But the elastic doesn't go through the holes of these ear loop adjusters. I tried to squeeze through the hole but couldn't get through. but I have some masks with very thin cord that actually goes through the hole. I think some rubber bands might be too thick. It just depends on what is used for the ear loops. I can still use some masks, but not all. There are many in the box so I am giving some to other members of my family who may need them as well.
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