they are quite squidgy to touch but are very easy to twist around a cable and not too sticky to reposition to the right place. Once sited though they stay put. Even though they are rubber like they don't squeak and seem to be doing an excellent job of not damaging the paint on my bike.
a simple idea that works brilliantly, I've since ordered more to use on all my bikes.
so buy, mount and forget resting assured your paint is safe from harm.