Must try
I have long, smooth asian hair.  When ever I have a bun, I have to constantly redo it because it falls out.  These actually do work!  My bun stayed secure even through an exercise class.  Amazing!  I saw the negative reviews of the sharp edges....my pins had the balls at the ends.  Maybe one vendor is selling an old/cheaper version.  I would definitely recommend if you put your hair in a bun.  It takes 5 seconds to twist it in your hair, very quick and easy.
Rating: 5 stars