Lanyards, or fliplines, is the piece of rope that is attached to each of your side d-rings of the harness and goes around the tree. It is a primary climbing tool and necessary for climbing trees. It temporarily holds you in position and allows you to climb short distances. It is a second safety attachment point when cutting trees. A flipline is a steel core lanyard used by climbers with spurs or spikes doing removals. Heavier than lanyards, these act as mechanical ascenders and are chainsaw resistant. The ideal length for a lanyard or a flipline is 10m (30 feet). Some come with snazzy features such as adjusters or auto-locking carabiners.