87GN over at Vuurwapen Blog posted recently about the fake CAT Tourniquets that are finding their way to the market. These are very convincing fakes of a very popular tourniquet. If you have purchased a CAT tourniquet recently, I suggest that you check it against the PDF that is linked at Vuurwapen Blog.
It is vitally important that you avoid these knock offs at all costs (and all knock off products for that matter). It is not simply a matter of saving a few bucks. These literally do not work. The windlass is too flexible and will not provide sufficient leverage to tighten the tourniquet. They can not be used to stop extremity hemorrhaging. These have the potential to get someone killed.
Check your CAT tourniquets and tell your friends to check theirs.