30' X 40' Heavy Duty 14 By 14 Cross Weave 10 Mil Silver 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 6.0 oz. Per Square Yrd. - 10 Mil. Thick - 14x14 mesh count, 1200 Denier Thick Grommets every 24 inches UV treated on both sides for superior sunlight protection Silver Tarps - High-Density Woven Polyethylene