I have very recently found myself in possession of a brand spanking new set of Super Sensitive Supremes. I am most eager to try them out, and I plan to string the bass up with them as soon as I get the chance. I also just got a flat chromesteel G string so, I want to try it with my Obligatos before I remove them. Anyway, included with Each string is a little felt washer. I have seen these before, but never one for every string. What goes into deciding whether or not to use these? I have never used them before. Also included is a little piece of soft metal, 1" or so, with G string. It looks like a piece of tubing that has been ripped in two so as to create sort of a cupped ribbon. What's the deal with this?