A high tenacity copolymer with excellent knot strength, abrasion-resistance, stretch and suppleness. Sometimes called double strength nylon. Used for all species, the light gray provides superb camouflage in any sub-aquatic environment. Powerflex has the perfect combination of elongation and tenacity, and RIO will match it against any competing brand, any time. Available in single spools or in 3 packs containing 1 spool each of 3 different sizes. 30 yards in sizes up to 25 lb. strength, less for heavier weights.