The RIO Powerflex Tippet will help you maximize your chances at a hook-up and minimize the worries of breaking off that "once in a lifetime" fish. 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 we will match it against any competing brand any time.