The lightsaber hilt of a Jedi/Sith has been cut by an enemy's lightsaber frequently during duels as most of you have already noticed. [url=http://www.youtube.com/watch?v=SOA9CpiWrI0&t=18s]Kazdan Paratus[/url]'s lightsaber hilt is made of a metal which is impervious to lightsaber damage. So why aren't other lightsaber hilts made of the same material? Imagine how different things could have been for Darth Maul when he battled Obi-Wan on Naboo.
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It's a Mandalorian iron called Beskar, extremely hard to find but it is resistant ro any lightsaber attacks. Most commonly used by Sith instead of Jedi, since Mandalorians were never on the same side as the Republic.