Carbon Bangle

Carbon Bangle is an accessory.

Source
Carbon Bangles can be obtained by one of the following methods:
 * Justice Monsters Five reward
 * Hunt reward for A Nightmare Came by Ferry
 * Purchased for 2,000 gil from:
 * Taelpar Rest Area
 * Lestallum
 * Verinas Mart
 * Imperial vendor outside of Steyliff Grove in Chapter 7
 * Collectible around the world:
 * Wiz Chocobo Post
 * Glacial Grotto
 * Pitioss Ruins