Cortosis

Properties of Cortosis
Like it says on Wookieepedia, pure cortosis does short out lightsabers. However, the brittle nature of the material, as well as the rarity, does not enable weapons to be made out of it. Therefore, the only property of any cortosis product on Sithspawn is to resist lightsabers.

Cortosis Products
Cortosis Weave (For blades and armor)

Cortosis Weave Fighting Gauntlets