Canon:Obdurium

Obdurium
This incredibly rare and hard metal represents the pinnacle of nonmagical metal. Treat weapons and armor crafted from obdurium as adamantine, except for hardness (30), hit points (60 per inch of thickness, or twice as many hit points as a typical item), and price (twice the listed price for adamantine). HP: 60 per inch of thickness; Break DC: 48 + 4 per inch of thickness.