Foto&Tech's soft release buttons are made of solid brass with a concave surface. This allows an easy, manual press at the top of your camera. It comes with 2 pieces of soft metal shutter release button. To install, simply attach the soft release button onto the threaded shutter release socket of your camera. After locking it in, enjoy clicking away with our soft easy shutter release buttons. Besides the shutter release buttons, it comes with rubber O-rings to fit other cameras, specifically compatible with Fujifilm X series camera. For other brands that do not need the rubber O-ring, you can add a small piece of Teflon Thread seal tape (not included) on the button screw. It will keep the shutter button to stay still on the camera. Note: It also fits other cameras with a standard threaded shutter release socket which is designed by the camera manufacturers to accept a mechanical shutter release cable. Compatible with Leica Q3 Monochrom Digital Camera. SpecificationsConcave surface diameter: 11mmThread size: ¼ inAvailable Colors: Comes in Red, Black, Gold, Dark Red, Package includes: 2 x Concave Surface Shutter Release Button, 2 x Rubber O-Rings