I ordered several of these in two orders before using them. They appear to be mixed with wax or some other substance. You can rub them on a leather strap and they will come off. Usually a stick compound doesn't wear out much when you put stress on the leather, but they do wear out a lot. Then, when used, the composition accumulates on the knife and does not remain on the skin. I've used other connections that don't. Don't waste money.
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