Shatex Shade Fabric for Pergola/Patio/Garden New Design Shade Panel with Grommets 20x24ft Black 90% UV Block Shade cloth,light and flexible. Breathable fabric,allow air and wind go through,lowering the temperature and creat cool comfortable outdoor space. Reinforced edges with grommets ,easy to attach.the space of every grommets is 17.7". It is durable as a shade attached to the top of pergola. Easy to cover on greenhouse in the Summer to protect plants.