Choose the black polyester cord handline for all normal use. It is a very high quality reliable handline. If you are using scenery carriers under heavy load on long tracks it can be advantageous to choose a rope with virtually no stretch. Flints stock a Dyneema rope with a matt black polyester cover which is indistinguishable from the polyester rope except its working stretch is less than 1.5%. The Dyneema Pro is the best choice under very heavy loads because it does not have a polyester cover and the master carrier clamps directly to line. The working stretch on this line is below 1.3% [Breaking load 5000kg!]