I just received my order of a set of pirastro Flexocor`s ( thanks for all the advice given here )and as I knew to expect from these forums the G string includes a rubber thingy (for lack of a better word). The problem is is that theres no manual included on how and when to use this "thingy" Now I think figuring out the how isnt going to be that much of a problem since Ive seen them on basses before. But is there a guide to WHEN to use em. Is it better no not use them or if you only play arco to always use them ? You guys got any advice ? I can imagine that such a rubber thing would significantly impact the sound of the string, or is that just me ?