This cord end may add a delicate look to your design but it is just as hardy as the rest of them. The four prongs have a small protrusion at each end designed to bite into the cord and hold it permanently in place. Measures 11x5mm, fits 2mm cord.
Since I'm the kind of beader who wants to feel confident my jewelry will last, I prefer this type of cord crimp with the articulated prongs for a sturdy, solid grip. I also use Tool Magic on my chain nose pliers so I can compress the prongs without concern of leaving a mark. If you don't have Tool Magic, masking tape wrapped around a few times also blunts the hard edge of the plier jaws without losing any force! This is the best leather crimp I've found.