A STRONGER LINE.You have used Rio products before and if you haven't you need to try them. RIO's Powerflex Plus 50-yd. Tippet Spool is one of the strongest nylon tippet materials ever made. It boasts tensile strength up to 20% more than regular tippet. Plus, the material is soft so it doesn't compromise knot strength or suppleness. Ideal for dry flies, soft hackles, nymph/indicator rigs and streamers. 50 yds.