RIO Products Fluoroflex Strong Tippet 30yd 4X. The material is very easy to tie knots in with high knot strength and a smooth finish that ensures knots seat easily and tightly. The high break strength to diameter ratio makes this a fantastic fluorocarbon for the trout fly fisher. Specifications for RIO Products Fluoroflex Strong Tippet: Manufacturer: RIO Products Fabric/Material: Fluorocarbon Fly Length: 30 Yards Package Contents: RIO Products Fluoroflex Strong Tippet RIO Products RIO-22437: Fluoroflex Strong Tippet 30yd 4X