Sterling Rope Cordelettes Spring 2010 The 7mm has a breaking strength of 3,210 lbs and was rated one of the best by an independent test. It is available in spooled and packaged pre-cut lengths of 18in. 5.4m, 21in. 6.4m, and 25in. 7.6m. SPECIFICATIONS of the Rope Cordelettes by Sterling MBS: 2,788 lbs 12.4 kN ALL CLIMBING SALES ARE FINAL.