Double Braid Climbing Rope: Double braid rock climbing rope feature a 16 high strength strand polyester cover and a core made of nylon. Nylon core have superior strength and remarkable stretching capabilities. So x xben 10.5mm static rope have pull (max tensile force): 25 kn(5621 lb), max bearing: 2000 kg (4409 lb). also being extremely light(75g/meter). The most important is polyester cover has tremendous abrasion resistance,retains can hold strength when wet.