(This post is copied from my response to someone that was asking about Future synthetic tips,and comparing them to phenolic.)
I have used them for years,and absolutely believe in them. I am not using one at the moment,because I don't have any. A close friend of mine is lifelong friends with the guy that makes these tips,so I "got the hookup",so to speak. I asked him about getting some 2 days ago,and he said he would try to call him. The black one is best for breaking/jumping,but they can be a pain to install,as the compound they are made of is kind of slick on the bottom. I have had good luck sanding the backs down with 100 grit paper,the adhesive backed kind,glued down to a piece of steel to obtain optimum flatness. When gluing,apply a small amount of glue to the ferrule,spread it around with the tip,then blow on it and let it dry for a few seconds. Apply a little more glue,spread it around,then center the tip and place the tip against a door facing or other solid surface,and gently lean into it for 10 seconds,then let it sit for 10 minutes or so. These tips have a tendency to develop stress cracks after a while,so they are by no means permanent. I have also never installed one and cut it down on a lathe,just a Porper pencil sharpener type cutting tool. Using this type of cutter,these tips peel like an apple,as opposed to turning into dust like a leather tip. Hope this helps. Tommy D.