It's skilltapes with following mods:
- Force Power Regen: +25
- Double-Bladed Lightsaber Accuracy: +25
- Double-Bladed Lightsaber Speed: +25
- Jedi Defence State: +24 (not 25)
(Vendor location: /waypoint -5471 6554)
And a small resource bonus inside aswell, containing current (06-01-2018) best Training Lightsaber(x3) and Double-Bladed First-Gen(x20) Resources.
See pictures below of the items: