Core Leather

Core Leather is rare leather found only by skinning high-level beasts in the Molten Core. It is used in a variety of high-level recipes.

Source
Core Leather can be found by skinning any of the Ancient Core Hounds and Magmadar in Molten Core in Blackrock Mountain.

Core Leather as an Ingredient
Core Leather is used in the following recipes:

Blacksmithing

 * Dark Iron Boots
 * Dark Iron Gauntlets

Leatherworking

 * Chromatic Gauntlets
 * Core Armor Kit
 * Corehound Belt
 * Corehound Boots
 * Molten Helm

Tailoring

 * Bottomless Bag
 * Core Felcloth Bag