For long, wandering trad pitches, alpine routes, or waterfall ice climbs, the Beal Cobra II 8. 6mm Rope helps you reduce rope drag and fall force on marginal protection. The 8. 6mm diameter gives you an ideal balance between weight and durability, and the Golden Dry treatment coats both the core and the sheath to stop moisture absorption, freezing, and premature wear. The half-rope system also allows for full rappels without dragging along a tag line.