A perennial favorite of professional climbers, the Sterling Nano IX 9.0 mm climbing rope is certified for use as a twin, half, and single rope. Whether at the crag or in the alpine, this incredibly versatile rope is at home on the worlds hardest climbs. . . . . . Triple certified certified for use as a twin, half, and single rope. Its both the largest diameter half rope Sterling makes and the skinniest single rope. Perfect for sport routes, trad climbs, ice or mixed conditions, and long routes where rope drag could be a concern. Recommended for use by experienced climbers not intended for top roping or working routes.