This whole furling thing is a new deal for fly fishing to me, my granddad had a gizmo to furl sisal twine into a rope on the farm so I understand the concept. I tried furling some 12 lb. Fireline and was not real happy withthe resultant leader, so I braided one that tapers from 4 strand to 3 strand to 2 strand then the tippet. I figure if it doesn't work our as a leader I can use it for a tow rope.