The long tillering string (it's seven feet long without the timber hitch) is twenty strands of B50. It stretches pretty bud, but it's been decent enough to tiller anything below a hundred pounds (my one ash warbow was a real pain- I eventually broke it, possibly because I didn't have a means to tiller it properly and partially because I attempted a warbow waaaaaaayyyyy too early
), and my skinny strings are very low count FF+ with B50 to build up the loop and hitch, double serving to keep my fingers intact.