Keep the taut pitch you set all night every night with no additional effort. Nine foot tarp lines of our high visibility two mil un-rated nylon cord with integral tensioners made of Thera-Band®. Stronger than surgical rubber bands, these heavy strength rubber tubes, originally designed as exercise material, are fashioned to provide 4-5 inches of tension adjustment per line to insure taut pitch for tarp materials, such as silicon impregnated nylon, that are prone to overnight stretch, especially in rain and heavy dew. A two inch loop in the end of each line enables quick secure placement or movement between tarp loops without tying a knot. Each cord weighs 0.4 oz.