24 Strand Climbing Rope for Climbing Arborists, Linemen, Utility Workers and other Professional Climbers. 24 Strand Line is a versatile Climbing Rope for Double Rope Technique (DRT) and for Stationary Rope System (SRS), also known as Single Rope Technique (SRT). 32 Strand Kernmantle is also great for tree service professionals only using SRT. SRT requires very low stretch rope / static line. Click HERE to see all of our climbing lines. Contact us if you would like help deciding on the ideal rope for you – 407.557.8878 or Info@EngRope.com.