INFO: The Jin'ha were a mysterious species famous for their work on the lightsaber resistant cortosis.
RACE: Jin'ha
HEIGHT: 1.7 to 1.8 Meters Tall
SKIN: Unknown (only seen in cortosis armor)
DISTINCTION: Cortosis craftsmen
LANGUAGE: Galactic basic standard
HOMEWORLD:Unknown
BIOLOGY AND APPEARANCE:Unknown but basically humanoid.
CULTURE AND HISTORY:Obi-Wan Kenobi fought a group of Jin'ha during a weapons shipment to the Black Heth. Later, he and Qui-Gon Jinn fought an army of Jin'ha on the planet Obredaan in order to free the captive Jedi Masters Eeth Koth and Plo Koon shortly before the Battle of Naboo. The Jin'ha prove to be good warriors during this conflict, but were defeated by the Jedi.
The Jin'ha also sold some of their cortosis ore to the Trade Federation, which crafted it for their experimental assassin droids. The common weapons the Jin'ha used were pikes, maces and blasters.
The Jin'ha was a mysterious culture from the planet Obredaan. They were supposedly weapons dealers as they made cortosis weapons that they shipped to various gangs and the Trade Federation.
There weapons however, became useless when Obi-wan infiltrated a factory and collected a sample of the cortosis. The Jin'ha Cortosis droids however, were used in the battle of naboo. While their species remain relativly unknown there is evidence of self enhancment that was used, with cybernetics and droid funding for smaller unlisted projects enabling the creation of secret battle droids and enhanced Jin'hain subjects.
APPEARANCES:Star Wars: Obi-Wan (First appearance)
SOURCES:Star Wars Insider 59
I would like to thank Wookieepedia for this info.