I bought zippers for face masks. I make masks for my family. I also bought several masks from different sellers. What annoyed some members of my family (impatient husband) was tying the rubber bands or cords behind the ears or head depending on the mask type. Using these switches quickly solved the problem. Adjusting the face mask for a comfortable fit has been made easier with toggle closures. Several masks I've bought had a thick cord. Because this cup set comes in a variety of sizes, it was easy to find closures for thicker lines. Let's be honest this product is overpriced but there are many switches out there and so far each has worked flawlessly. I would buy them again. masks
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