Rio Powerflex Copolymer is Rio's best selling tippet used by many of the World’s best Anglers. A high tenacity copolymer with excellent knot strength. PTFE coated for added abrasion resistance, stretch (26% elongation) and suppleness. Used for all species, the light grey 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.