these really are strong as advertised, and ACTUALLY work for thick/voluminous hair. I can feel how well my twist is being held to my head. I've been using the big boxy claw clips for YEARS but they always fall out of my hair; it's gotten so bad I've spontaneously SHATTERED multiple of them either trying to put up my hair or even just accidentally bumping the back of my head on something while wearing it. I usually do a very sloppy french twist that keeps all the hair out of my face. Note: if you have wispy/slick but thick hair like mine (where you have a lot of baby hairs and also a thick ponytail) you can consider buying more than one clip as well to help keep things in place better. That being said, with a little trial and error the biggest size holds my just-past shoulder length hair very well. THANK YOU share studio for this ingenious design because I was rebuying my old ones literally every couple of months!!!