USB 3.1 Front Panel Header to USB-C Type-C Female Extension Cable 40cm with Panel Mount Screw
USB 3.1 require a different front panel header than USB 3.0.
The USB 3.1 port interface is using the USB 3.0 pin set and more. It is design to be backwards compatible (will explain later).
There are no official release of the specs for the USB 3.1 header yet (as of this writing),
But first motherboard with this is the ASUS ROG MAXIMUS IX FORMULA, STRIX Z270I/Z270G etc.
Length: 40cm
Connector1: Type-C Female with Panel
Connector2: USB 3.1 Front Panel Header