Most people use carbon fiber strips made by gordons, available at Binghams and other bow supply stores, these will add speed to your bow , between 5 and 15 fps of a comparible fiberglass backed bow. I have experimented with carbon fiber tape that I bought online, can't remember were I got it from. It is a 45 degree weave,I put it on a wooden bow with epoxy. It added about 10 lbs draw weight but only about 10 fps speed, so about the same as a wooden bow of the same draw weight. I have read that carbon fiber with parrallel strands would give more speed, but haven't tried it.