Leveling line is a high-strength line that will not sag or stretch. Each Line is 450 ft and unspools from the center core of the tubular casing this prevents tangling and allows you to use only what is needed. This line is used during the layout of the ceiling grid to ensure it remains level during assembly. Use with lever action grid clamps for better results.450 ft of high-visibility orange leveling line in each dispenser tubeEach line is individually wrapped and un-spools from the center, leaving the tube intact and improving handlingHigh-strength leveling line will not sag or stretch, yet is sufficiently elastic to allow the grid to be repositioned several inches away without resetting the grid clampsFour leveling lines in a storage pack