The Duel Disks are almost completely black, and are decorated to look like the head of a dragon. The Deck is placed in the mouth of the dragon head. These Disks are used by the Dark Signers Carly Carmine, Misty Tredwell, Devack, and Roman Goodwin. Roman's Duel Disk is modified to attach to his mechanical arm instead of going around his wrist.
In Carly's case, her duel disk was transformed from a borrowed standard Duel Disk once she transformed into a Dark Signer.
In Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia, the player can purchase this Duel Disk from Chihiro for 10 Star Chips after story mode has been beaten.
In Yu-Gi-Oh! 5D's World Championship 2011: Over the Nexus, the player can purchase it the same way as mentioned above.