The key is a golden Celestial Spirit Key, with the top of the bow of the key sculpted to look similar to a ram's head with horns sprouting out of either side. The center of the bow is a white heart stamped with the crest of the Ram, colored pink. The blade of the key's design seems to be derived from a ram's curled horns, with the very bottom appearing to be a hoof.
While in possession of the key, a Celestial Spirit Mage may be able to summon the Ram Aries by reciting the quote, "Open the Gate of the Ram! Aries!". This key summons Aries, a woman dressed in wooly clothing and attacks the opponents with Wool Magic.