These fidget strings are cool. They are a lot thicker than expected. But my son and I have stretched them as far as they can go and they are still in good condition.
The only draw back may be you have to be careful near hair. I stretched it behind my back and then slowly came up and quickly grabbed my hair tightly. It hurt really bad. I had to stop and relax and think. To untangle your hair from the band just stretch it back out so it's thin and you can just pull it out.