Dynamic Rope

A dynamic rope is a stretchable rope. It is specially manufactured, somewhat elastic rope used primarily in rock climbing, ice climbing, and mountaineering. The word stretch makes the rope 'dynamic', in contrast to a static rope or semi-static rope that has very low elastic behavior.

Dynamic ropes can be classified into three types: single, half, and twin. For most of the applications, only a single rope is needed. The single ropes are available with different diameters from 9.2 to 10.5 mm and are perfect for sport climbing, top-roping, and big wall routes.

Iridium Rope

It's perfectly good to use a dynamic rope for the abseil. But if you're going to be doing it lots of time, there is a chance for the knacker your rope so it would be best to use a static rope or semi-static rope for the job.

For customary, general-purpose wire ropes, in measuring diameter, the industry is leaning toward a “soft” conversion to metric during the transition period. In sizes smaller than 5/8′: the rope diameter is rounded to the closest 0.5 mm.

All-round climbing rope's average diameter is  9.8 mm to 10.2 mm. You won't fail with one thing in this range, but your personal sweet spot for a particular type of climbing may vary from 8.9 mm to 10.7 mm. A static rope or semi-static rope is better for rappelling because it's easy to pull. It has a few wears from rappelling over edges, etc.

But dynamic ropes are also often used for rappelling. It is not good to climb with a static rope though, because it doesn't stretch to absorb shock, therefore there is a chance for breaking it suddenly.

Dynamics ropes are a part of abseiling. Two ropes needed for it. Through the anchor thread the end of one rope and hold one end of each rope together to make a loop at least 60 centimeter from the end. Put the ends of the ropes through the loop to make an overhand knot. Pull every strand of rope terribly tight on either aspect of the knot, ensuring the knot is neat.