The 4th generation of Orvis's Helios series, the Helios F Fly Rod lets us cast dry flies, nymphs, and streamers with more finesse and greater accuracy. The new Helios is now 25% stronger than the 3rd generation Helios with 4 times more casting accuracy, taking our fishing experience next level. The "F" stands for the "Finesse" series of rods designed for more delicate or precise presentations that call for world-class accuracy.