Scientific Anglers Frequency Intermediate Fly Line Posted in Fishing Lines & Leaders, Sportfish The Scientific Anglers Frequency Intermediate fly line is built with a slow sink rate. It is perfect for stillwater situations. Colour: Atmosphere Blue Sizes Available: WF5 – WF8 Store: Sportfish Buy at Store Related PostsRIO Elite Single Hand Spey Intermediate Fly LineRIO Elite Single Hand Spey Intermediate Fly LineRIO Premier Coastal Quickshooter XP Intermediate Fly LineRIO Premier Coastal Quickshooter XP Intermediate Fly LineScientific Anglers Amplitude MPX Floating Fly Line