I buy 900 or so foot spools of LPG and sleeving material and make all my own. In 50 pound I have 30, 50, and 100 foot in 90 pound same lengths plus 30, 65, 85 and 120. Sometimes space is small so the short lines is all that will work and other times I enjoy the short lines 30 or 50 ft so I can see the kite and wraps on wing tips to make ground recovery easier. Light wind has became my preferred wind for duel line. When the wind picks up above 10 or so I usually get out the quads.