Review on 🎭 100 PCS Cord Locks for Mask, Black Elastic Adjuster Silicone Cord Stoppers, No-Slip Earloop Toggles for Drawstring Buckle Clasp Spring, Elastic Cord Adjusters Non-Slip Stopper by Kristen Simpson

I can see why you're getting 100 for the price. The first thing I'm going to say about this is that things don't last very long. It only took a few days for the silicone part to start cracking. I've been through quite a few of these. They're also not the easiest thing to put on a mask. The tool they provide does not come with any instructions on how to use it. I suspect that you can somehow attach and pull the side of the mask to this tool, but there isn't an exact way to do this with the tool. The tool is also quite flimsy, so it cannot be used to force the mask loop through. This works for most masks as far as I can tell but again they don't seem to last very long which explains why you need 100's of these masks. It holds my mask well and is easy to set up. Overall it's a good thing as long as it lasts, but it tears easily and is a little difficult to attach to the mask. There are no real instructions on how to use the tool provided, and the tool is a bit flimsy, but it works. This will keep your mask on your face and make your mask look better.