GRIFFIN NylonPower is a strong specially treated nylon with double the tensile strength of conventional nylon. GRIFFIN NylonPower Bead Cord stretches only about 3 ? 4% under tension and will return to its original length when released. This property is a great advantage when beading- as knots can be placed very firmly and permanently. Apart from the firm characteristics of this thread- GRIFFIN NylonPower also possesses a smooth surface and an unsurpassed color brilliance.