... interval 1m or three feet ,corner reinforced with triangle plastic sheetscharacterics1.Binding resistant,press resistant, 2.water-proof ... 3.antifreeze,corrosion-resistant, 4.could be produced with uv to five years application:special for Agricultual use ... ,professional in manufacture------------Weifang Huacheng Plastic Modification Co., Ltd. PP/PE black plastic mulch film for agriculture and gardening ...