Available in 100′ or 200′ lengths, the primary search lines are made up of 9.5mm Kevlar over polyester rope and two non-rated carabiners. The primary line comes in two different bag styles, our Chicago style bag and our Standard bag. Both are made of Cordura material. Primary lines have the option of being equipped with the knot and ring marker system. The ring provides a secure fixed anchor for attaching tag lines. The knots indicate direction and distance to guide the searcher.