yep, after last month's panic, I bought more stitch markers. These "Boye" makers come in a cute little case, and they lock! They are a little "rubbery".
Because the ends are rounded and the whole thing is a little rubbery, they were a little tough to poke under a stitch. They didn't "glide" against the Debbie Bliss Cashmerino Aran I was using. Maybe they will slide better with acrylic? (like likes like?). If you wanted to intentionally split the yarn, these would not work. The locking part was a little awkward. Once I got it locked, I had to use my fingernail to get under it to get it unlocked. It was not a smooth first go and I admit that I didn't make it halfway through my project before switching back to my beloved Clover locking markers.