Friction is exactly right. This is a great price and I loved the quality. Pros: Quality material and well constructed. Now I notice that it was only ONE slit on only ONE of the headphones. Not wanting to spend two to three times as much for a more well-known brand I thought I would try this bike rack. The problem I had is that I use them to listen to music an iPhone and iPad. Otherwise I hope my review can be of help. After getting headset hair comments from my wife, my father and my barber I decided to try something different, and thats what this is. I have so many to choose from too. I received a co