RIO Powerflex Plus Tippet - RIO’S Powerflex Plus Tippet. RIO’s newest tippet is the strongest nylon tippet material ever made, with tensile strengths up to 20% more than regular tippet. A highly technical formulation of the nylon copolymer manufacturing process has resulted in this prodigious strength increase, without compromising knot strength or suppleness. Simply put, this is the strongest, most reliable tippet ever made. Incredible strength to diameter ratio Soft material for high knot strength