400lb 100% Dupont Kevlar Braided Line, 1.7mm Dia, Cut and Abrasion Resistant, Low Stretch, Heat Tolerant to 900 f(heavy duty speargun band constrictor line, model rocket paracord, survival/tactical) FIBER TYPE: 100% Genuine Dupont Black or Yellow Kevlar(R) yarn made in the USA. No off brand substitution! No fine print about other fiber in the braid! DIA: 1.7mm LEN: (select) TENSILE TEST: 400lb (See important notes about tensile strength and appropriate applications in main description) MAX DUTY BAND CONSTRICTOR: Perfect! Low stretch, great knot retention, no melting. Just tie an extra constrictor and trim it flush for a clean finish. HEAT RESISTANT TO 900+F - Great parachute cord for model rockets, fire poi and sewing thread for welding garments. SURVIVAL/TACTICAL/OUTDOORS: Fishing line, tent stays, snares and gear repairs. A small coil in your pocket saves the day in 1000 different ways.