Scientific Anglers Amlpitude Smooth Infinity Salt Floating Fly LineSCIENTIFIC ANGLERS AMPLITUDE SMOOTH INFINITY SALT FLOATING FLY LINE The highest performance smooth fly lines in the world. With up to five times less drag and eight times the durability of traditional lines, this will change the way you look at fly line performance. Same exact design as the textured Amplitude Infinity, but with a smooth finish. 10 foot Black sighter at the end of the Sand running line, Horizon head. WF7F thru WF12F.