Material are metal and rubber, which keeps your phone secure when charging. Ive recently been getting more into powerlifting and have been doing a lot of heavy pressing. I was pleasantly surprised to see that this, is the way I want to go! The fan adjustable grip didnt fit between them. I tried unsuccessfully to install this kickstand on my new Schwinn Kedzie. Big boom in a tiny package with great audio attenuation and sound, long bluetooth range, punchy bass, and a long battery life. When plugging in a USB as an OTG I had to go into settings and activate it as it has a time limit of 10 minutes. Very flimsy. "Oops. Initially the base was harder than I expected and not as comfortable as the previous 5 or so Oakley sandals I have owned.