The Riverstone line of fence panel is designed to be an easy to use, shade producing pane; that is UV stable and will last for several years in the hottest environments. All their woven fence panel are proudly made from black woven polypropylene strands in the USA. Each panel comes with brass grommets for securing the fence. The grommets are placed approximately 2 feet apart around the perimeter of each fence. The percentage listed indicates the amount of shade that is being provided. This also reflects how tightly woven the fence panel is.