There are UV stabilizers on both tapes and lamination ensure longer life of tarp. Poly tarps are water-proof, rot-proof and dust-proof. Tarp feature heat-sealed seams, reinforced Corner grommet, aluminum eyelets, reinforced with strong poly rope in hem. SUPER HEAVY DUTY- Weighs 8 oz. per Square Yard, 16 MIL Thick with a 16x16 Weave Count Waterproof, and Acid, Tear and UV Resistant Grommets Spaced Approximately every 18 inches and at the Reinforced Corners Durable and Designed for Continuous Outdoor Use Finished Size- Tarp will Measure to the Size Listed UPC 655329124045 ASIN B007ZSZX1Q Size 12' x 40' Color Brown Material Polyethylene (PE) Item Weight 26.7 pounds Manufacturer Tarps Direct Item Thickness 16 Mils Number of Items 1 Item model number BR12x40 Product Dimensions 480 L x 144 W Water Resistance Level Waterproof Center To Center Spacing 18 Inches Ultraviolet Light Protection True Is Discontinued By Manufacturer No