Engineering grade plastic
Weighs 52-Grams
Seemed kind of like cheap plastic, so I bent the crap out of it trying to break it and it didnt so its not cheap plastic. Very light and will adjust to about anything. I bought it for a wierd water bottle that I have that is a tapper size. It wouldnt fit but anything else will. I am going to mount it as my secondary. Will also clamp down on non water bottle stuff in a pinch.