Hero 8/9/10 90° Lens PCB
The 90° lens is to mount your naked GoPro motherboard horizontally with the lens. This allows for better aerodynamics and soft mounting.
Please see the following link for more information about this product. http://tiny.cc/90degPCB
*CONFIRMED to work with Hero 9/10 You just need to cut off the 2 tabs and it will fit onto the Hero 9/10 motherboard