When I first started reborning I bought some crushed glass that looked very much like these pictures. It was sharp, but I thought that as this is what people are using, it will be fine and I put it in to the limbs and the colors made the limbs looking bruised. I only bought couple of kg, and ended up throwing them out. I am glad because I am sure the roughness would not be good for the vinyl. I buy now lovely, perfectly clear round beads, which are about 2 millimeters and stay very nicely in stockings, but they cost me about $6 / pound. I also buy some of the fine sandblasting medium glass, they are also perfectly round and about the texture of sugar; they are much cheaper(about $40 for 25kg = 55pounds). I use those for the limbs.
If this seller is selling really nice round smooth beads she is not doing herself any favors by not having better photos.