The Control Running Line is designed for anglers who want to keep a clear count of the line length released when using a shooting head. Its monofilament core provides a slightly stiffer running line than a fine braided model, which helps reduce unwanted loops in the basket or on the ground. The markings every 5 meters are useful for repeating a distance after a strike or repositioning the fly on a specific current. The loops tied at both ends simplify connections to the backing and the shooting head. Choose based on the strength you need: .033" for 20 lb or .039" for 30 lb.