The Nite Ize Figure 9 Tent Line Kit replaces fiddly knots and plastic sliders on your tent guy lines. It contains four lightweight black plastic Figure 9 tighteners and four reflective guy lines (8 ft x 3/32" each, per the pack). Clip or loop the line to your tent or fly, wrap it through the Figure 9 and pull it tight: the line holds its tension in wind and rain, and is just as quick to slacken and pack away. Instructions are moulded into each tightener. The reflective lines show up in torchlight, so you are less likely to trip over them in the dark. Each small Figure 9 fits cord from about 2 mm to 5 mm, so you can also use it with your own cord, on tarps, gazebos and washing lines.