Fireline is a pre-waxed, braided cord consisting of gel-spun polyethylene which is known as the strongest fiber, per diameter, ever created. It has an unbelievably high tensile strength and has been recommended in numerous how-to articles on beadworking.
This is a 6 lb test thread that measures about .006" inches in diameter. There is 50 yards of thread on a spool. This thread will fit a #12 size English or Tulip beading needle.