The PLKB Navigator V5/6 leader line set 10m is the first half of your power lines. The lines are split at 10m as a stopper of the safety system. The first 10m could also wear more because of twisted lines. With this set you can replace this first 10m.
p.s. The name may be a bit miss leading since leader lines are normally the first part of the steering lines on the bar.
