Impact Monofilament Running Line Yarn comes with System Foams which

comes with System Foams which can be switch to System Case

offers increased power and distance

convenient for sizing hackle at a show

it's a powder coated base that surely won't move on you

Impact Monofilament Running Line Yarn comes with System Foams whichDesigned specifically for use with shooting heads, the Airflo Impact Oval Mono running line is a slick oval shaped monofilament that is the perfect choice for light trout spey, single and double hand heads. Length: 40yds (37m). It has the perfect amount of stretch to remove any memory as well as protecting lighter tippets. The oval shaped low diameter mono offers very little friction in the rod guides for longer casts and reduced drag.