Check out www.bcyfibers.com . They had a comparison of break strengths and stretch so should give you some insight on the materials. I would think Brownell also has info on their sight but BCY material is what I started with and that is my preference. I know you can find string makers who aren't nearly that expensive and have the same quality. As to the two color strings/cables it isn't a problem to make them. I also heard BCY has a new two color string material out and looks sharp when made up. I have to get some of that material and see how they look.