Windwing kite lines are made from pre-stretched Spectra cord with Dyneema sleeving and are tension rated to 600 lbs (270 kg) per line. Kite line color coding gives contrast for better visibility on water and snow and reduces possibility of cross-connection. Sewn loop-sleeve sections are coated in heat-shrink clear tubing for easier de-tangling, and loops also have extra stitching at the top and bottom for added strength and durability. Simply put, Windwing kite lines are the best flying lines we've seen.