Arms Inventory is the basic armament used by all Fishermen, but it is not restricted from use by other Positions. Arm Inventories can store different items such as needles, swords, hooks and bombs depending weapons that wield a person. Besides their basic function of storing items, Inventories may possess additional features such as a cloaking function that renders one's equipment unseen to the naked eye. Inventories with additional features are items even a Ranker would find difficult to obtain.