Price for 10 metres of super strong, Technora, coated kevlar, constrictor cord. Around 1mm diameter, but with a breaking strain of 250lb this tying line has all of the properties you want in a constrictor cord. It's ultra high strength, ultra low stretch and superior knot retention mean that once tightened your constrictor knot will stay tight. Avoid the problems of knot creep or stretch inherent in other high performance fibers. Synthetic black surface finish for improved knot retention. One double constrictor knot is sufficient for even 3/4 inch tubing.