Our Kernmantle is U.L. and N.F.P.A. approved. All our Kernmantle ropes meet the requirements of the US Military specification MIL-R-24050-D. It is the Primary Choice for all Search and Rescue Crews due to it’s “Static” properties and Superior Tensile Strength of 6900LBS. (3137 KG.) 7/16″ (11mm)