It is about 30 cm long, 20 cm of which is the length of the blade. Miki keeps both blades inside a special sheath, strapped onto her belt hidden behind her robe.
Both daggers are wholly made from a mysterious crystal, glittering azure color, and they can instantly freeze any objects upon contact. Like any other Zodiac Angel weapons, the Northern Cross has a safety mechanism to prevent itself from being used by people other than Miki. Anyone else who touches the handle of the daggers will have their hands instantly frozen.
The Northern Cross is light weighted and possesses several special attacks that allow Miki to adapt to just about any battle style.