JB Camera Designs is a camera platemaker that specializes in camera specific wooden base plates that add a pop of vintage color and feel to your kit. The unit weighs in at 77g and comes with mounting screws, it is designed specifically to fit the base of the Fujifilm GFX 50s and measures in at 150mm x 15mm x 63mm.
Practically these sort of bases do not have much use beyond aesthetics. They won’t allow you to mount your camera to a tripod, they won’t make holding the camera any easier – just about the only two things these are really good for is adding a unique look to your camera and preventing the bottom of the camera from getting scuffed up.
The Amazon listing for this is not live yet, so we don’t have the specific pricing information on this base plate, but other similar plates have ranged from $50 to $100 for other camera specific plates from JB Camera Design, so it would be safe to bet this will likely fall within that range as well.