Kotap 40-ft x 40-ft Heavy-Duty 14 by 14 Cross Weave UV Blocking 10-mil Silver Poly Tarp, Item: TRS-4040 FINISHED SIZE: 38-Feet 6-Inch by 39-Feet 4-Inch Extra Heavy-Duty Applications: 14 by 14 Weave (10-mil thick) for extreme weather and job site conditions Superior UV Protection: 100-Percent shading from light and silver coating reflects UV rays Strong Grommet Applications: Grommets spaced every 18-Inch and reinforced plastic corner bars. Fabric Weave: 14 by 14 per square-Inch (10 mil thickness)