18 oz Heavy Duty Vinyl Tarps are perfect for industrial use. Our heat-sealed seams are bonded using the latest advanced available making these tarps 100% waterproof. Folded webbing reinforced edges provide strength and durability that include # 4 stainless steel grommets in all corners and spaced 24 inches apart. These Heavy Duty tarps are tear, puncture, chemical, and grease resistant.