I have quite a few of the standard larger orbit clasp (around 30mm length for both pieces together) and a couple pieces with the small ones on. All of mine work just fine, and are so easy to use. Some are from PP, some from Rio Grande. I passed on the ones from Bella, as they has a more pointed oval shape I didn't like as much. As we don't really know the manufacturer, I wonder if the stiff ones come from certain mfg. No way to tell. Luckily none of mine are, as my hands are terrible, and I can't work most of the other clasps at all. I do have a nice fat teardrop shaped lobster style clasp Celeste found for me for my Kamoka white pearls bracelet, and that one I can use ... yay. I wish someone would make orbits in other finishes, ie. tiny diamond or CZ pave or accents, brushed finishes (PP did get me one set of brushed yellow gold clasps), even etched or other surface treatment.