This is a USB-C Adapter. It is made of aluminum.
The adapter has a male USB-C end and a female USB-A end. Some people call this a USB-C to USB-A adapter, and some people call this a USB-C to USB adapter, and some people call this a USB-A to USB-C adapter.
Because we're keyboard people, what we care about is that this USB-C adapter allows you to convert your USB-A keyboard into a USB-C compatible keyboard.