Guardabosques
ArboristSite Lurker
I posted a pic of the Dan House Rope Saver. It is made with a very flexible metal conduit coated with a black rubber or plastic that looks like electrical tape. The ends are fitted with metal ferrules from an electrical supply store. They have a few wraps of electrical tape to hold them on. It isn't very high tech, there aren't any PVC parts on it, or any plastic aside from the coating.
The rope saver I posted a picture of didn't look like a Dan House because it wasn't. I just came across the New Tribe rope saver called the Su Rope Sleeve, which is what they sent me. It appears to be made of black vinyl as opposed to coated metal, which would explain the light weight and the ability to bend safely to a 2 in diameter.
Regardless, it''s a great product--check it out.