USB 3.1 Front Panel Header to USB 3.0 Type-A Female Extension Cable Panel Mount Type
USB 3.1 require a different front panel header than USB 3.0.
The USB 3.1 port interface is with the USB 3.0 pin set and more. It's design to be backward compatible (will explain later).
There is 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: 50 cm
Connector 1 : Type-A USB 3.0 Femaler
Connector 2 : USB 3.1 Front Panel Header
Support 10 Gbps rate