The rigidity of the cable depends on the inner core and the outer layer. Is it possible that the yellow coating is more rigid than the red? Perhaps my memory is wrong about this aspect of claimed rigidity difference.
Durometer is the term used to describe the hardness of the coating. Booth stuck his fingernail in it and declaired it to soft. I had it tested and found that the durometer varies for both within the same range. It has been is service now for maybe 20 years and other than a cracking problem from a former vendor many years (1996+/-) ago have had no problem. There is probably 20,000 units in service.
(This post was edited by JohnSherman on Apr 23, 2013, 1:06 PM)