30'x40' Heavy Duty 14 By 14 Cross Weave 10 Mil Silver/black Poly Tarp with Grommets Approx Every 24 Inches All Around, Corner Solid Plastic Bar Reinforcement for Extra Strength Finished Size is 3-5% or up to 10 inches less after edges are hemmed Aluminum grommets approx every 24. 6 oz/sq yard; 1200 Denier Thick Waterproof and Wind Resistant; Rot and Mildew Resistant Double reinforced corners for added strength. Arctic Flexibility 100% polyethylene high density woven scrim coated