Black dragonhide

Black dragonhide is a 100% drop from black dragons and the King Black Dragon. If it is brought to a tanner, along with 20 (or 40) coins, it can be tanned into black dragon leather. Tanners can be found in Al Kharid, the Ranging Guild, Varrock, Taverley, Canifis, Prifddinas and the Crafting Guild. Members can then craft the black dragon leather into black dragonhide armour. Along with all other dragonhides, the item is more often sold to make a decent amount of profit.

Dropping monsters
Black dragonhide Black dragonhide