From Dark and Darker Wiki
Head Armor
Beside adding armor rating like other armors, Head Armors have "Headshot Reduction Mod" stat that decreases the damage taken to the head by flat %.
Drop Tables
Where to find specific rarity of this weapon
DropTable:Rubysilver Cap 2
DropTable:Rubysilver Cap 3
DropTable:Rubysilver Cap 4
DropTable:Rubysilver Cap 5
DropTable:Rubysilver Cap 6
DropTable:Rubysilver Cap 7