Neewer 10MM Diameter Red Metal Convex Soft Shutter Release Button for Fujifilm X100 Leica M6 M8 M9/Nikon, Canon, Hasselblad, Olympus, Minolta, Rolleiflex SLR Cameras The button is made of Metal. It's polished and enamel painted. It's very comfortable to press on the button. The button surface and edge are very smooth. The screw thread is carefully designed and tested.