Free Shipping. Sterling Marathon Mega 11mm Rope Spring 2010 The Marathon Mega 11mm Rope by Sterling. The Marathon Mega at 11mm is a whole lotta rope. But dont let its size deter you this rope delivers extra strength and durability without sacrificing an ounce of performance. Ideal for military, rope courses, high-abuse guiding, work access, rigging, and industrial safety applications. SPECIFICATIONS of the Marathon Mega 11mm Rope by Sterling Dynamic Elongation: 30.80 Impact Force: 8.7kN Static Elongation: 9.40 UIAA falls: 9 Weight: 79 gm ALL CLIMBING SALES ARE FINAL.