This is 5 oz. Woven Landscape Fabric. The fabric is polypropylene needle-punched fabric. The landscape industry's BEST woven, needle-punched, polypropylene fabric designed for professional and commercial use and approved by leading landscape architects and most government agencies. Permeable, conserves soil moisture, increases growth, and prevents unwanted weeds from germinating. Twelve-inch spaced, colored lines make for easy plant alignment. Use anchor pins that we sell here for installation.