Sterling Rope Dog Bones 19mm Spring 2010 The Rope Dog Bones 19mm by Sterling. These versatile runners are constructed with 3/4in. nylon webbing. Each quickdraw style sling offers high tensile strengths and excellent abrasion resistance. Each length features one end that is sewn tight to the carabiner on one end and a wider loose end. Available in 4in., 5.5in., 7in., and 9in. lengths. ALL CLIMBING SALES ARE FINAL.