Silver Tarp 20x20 Heavy Duty Poly Tarp. Actual Finished Size 19' 2" x 19' 8"". Silver Tarp 5 oz. per square yard, 12 Mills thick, 12 x 14 mesh count, 1200 Denier. Heat sealed and rope reinforced edges with grommets every 18 inches. Reinforced Corners. 3 Ply Polyethylene material. Both sides are UV treated.