Sageo refers to the cord threaded through the kurigata - the small knob on the side of the saya (scabbard). Historically, it allowed a samurai to secure the scabbard to their obi (sash) and could be used to bind or tie in certain situational contexts. On modern collectible katana, the sageo is a purely aesthetic element, but it remains an authentic component of traditional mounting conventions. Teal sageo stands out as a bold chromatic choice: it creates immediate visual contrast against black or dark lacquered saya, and it echoes or complements the tsuka-ito (handle wrap) when both are coordinated in the same hue. For display-focused collectors, a matched teal ito-and-sageo set gives a katana mount a visually unified, intentionally designed look.