12 x 20 Silver/Black heavy-duty tarps- 14X14 Mesh Count, 12 Mil Thickness, 7 Oz. per square yard, brass grommets every 24 inches with rope reinforced corners and eyelets. All fabric is constructed of triple layer rip stop polyethylene. UV stabilized both in scrim and lamination for extra-long durability. Black underside stays cool in the sun. 12 x 20 Silver/Black tarps are 100% waterproof, rot proof, mildew resistant and fabricated in the U.S.A