Tarps are constructed of polyethylene with an 8 x 8 weave pattern and lamination on both sides. A polypropylene rope is heat sealed into the peripheral hem. Aluminum grommets are located every 3' around the periphery. Treated to withstand the ultraviolet rays of the sun. Available in blue and packaged in a poly bag. Thickness: 3.5 mil. Weight: 135 grain.