This from Richard Delaney / Rope Test Lab 6mm "rope" I need to talk about this as I know there are many considering ways to lighten their kits for rec, rescue, and tac operations. In short, if you slip or fall, it will cut. Completely. And you will fall. There are very good reasons why it is often only sold as part of proprietary systems with training (CTOMS/Trace, Petzl Exo, Sterling etc) and these all concern the very limited capacity, abrasion resistance, and life of this "rope". The abrasion resistance tests I have done (both vertical and lateral) gave results of up to 10minutes for some 11mm ropes. The longest result I got for any 6mm rope (not 6mm accessory cord) was 30sec and most cut completely in under 10sec. Based on my testing and experience, the only time I would use a 6mm "rope" would be when my immediate survival depended on it and there was no other option. The 6mm "ropes" used in the proprietary systems are not 6mm nylon accessory cords. They are often combinations of armamid (Technora), polyester, and some nylon. These "ropes" are expensive and are often given a maximum number of uses before retirement.