The Mammut Serenity is an ultra light rope for those times when weight is the ONLY concern. Smallest diameter and lightest single rope one the Planet; Coating Finish and Triosafe for optimum performance. Specs: Diameter: 8.9 mm Weight: 52 g/m Fall Rating: 5 Impact Force: 9.5 kN Elongation: 6.9% Sheath Slippage: 0 mm