These ancient gloves were once owned by the Dark Lord of the Sith Marka Ragnos. A thousand and forty-four years after Ragnos' death, they may have been found by Revan inside the Tomb of Marka Ragnos. The black scales used to make the gauntlets still pulsed with dark power.
The gloves could only be used by Dark Jedi due to the strong dark side aura that surrounded them.