Ozone Contact V4 bar safety flag out line for the click in loop bars. The safety flag out line attaches to the safety swivel below the bar to one of the front flying lines. This is the safety line for the Contact V4 bar and Foil Contact Water bar.
Very easy to replace, if you are not sure this video from Ozone is very good as shows the whole bar being worked on.
This safety flag out line is 58cm long and extends to 92cm when stretched. Pack contains one V4 Contact safety flag out line and thin dyneema mouse line to aid fitting.