@saker we don't actually know why there are sword rings on there but there are a few theories, one that it provides noise/distraction to the opponent, another that it helps entangle/degrade the opponent's blade edge, and yet another that suggests that the ringed sword thing was an effort to manufacture as many swords as possible as fast as possible while also making them reasonably durable
finally there's a theory that says they're purely decorative/performance embellishments