If you like your stitch markers to lock then these are the ones for you!
The plastic is really durable (I've not snapped one yet, and that is pretty good going!) and the pointy ends are completely smooth so they won't snag your work. They even come in a little plastic wallet to keep them safe so you won't have to go rooting down the side of the sofa every time you need one!
30 in a pack. That should keep you going for a bit!