Neewer 10MM Diameter Red Concave Metal Soft Shutter Release Button For Leica M Rangefinder M3 M6 MP M8 M9 M9P Nikon Canon Hasselblad Olympus Minolta Rolleiflex FUJIX100 SLR Cameras With Screw Hole It's very comfortable to press on the button. The button surface and edge are very smooth. It's polished and enamel painted. The button is made of Metal.