RIO POWERFLEX PLUS TIPPET MATERIAL - Strongest strength to diameter ratio of any nylon tippet material ever made, with no compromise in knot strength or suppleness. 7X(2.75-lb), 6X(4-lb), 5X(6-lb), 4X(7.5-lb), 3X(9.5-lb), 2X(12-lb), 1X(15-lb), 0X(18-lb). 50-yd spl