Scientific Anglers Amplitude Smooth Redfish ColdScientific Anglers Amplitude Smooth Redfish Cold Fly Line is built for quick, powerful casts. The Scientific Anglers Amplitude Smooth Redfish Cold Fly Line is built a half size heavy to deliver large flies in demanding situations. Scientific Anglers Amplitude Smooth Redfish Cold Fly Line The Amplitude Smooth series of lines are, simply put, the highest performance smooth fly lines in the world. With up to five times less drag and eight times the