The Sterling Rope 12 Millimeter Dyneema Sewn Slings offer significant performance advantages over traditional runners. They are lightweight, have high cut resistance, are extremely strong, and resist moisture. These features make them perfect for alpine climbing. Dyneema offers very little elongation and should not be used for dynamic falls. These 1/2" slings have a MBS of 5,170 lbs (23kN). OSHA 1926.251(a)(2)(i) states that material handling equipment "Has permanently affixed and legible identification markings as prescribed by the manufacturer that indicates the recommended safe working load"