Size: 18-Inch by 100-Feet Roll, 30mil Thickness | Color: Black Water/Bamboo Barrier is an extruded 100% post-consumer high density polyethylene (HDPE) Barrier with multiple uses. As a Water Barrier, it protects hardscapes and landscapes from subterranean water movement. When used around building foundations and medians, the tree root Barrier blocks tree and plant root intrusion, thereby preventing moisture loss and associated settling. When used as a Bamboo Barrier it prevents the unwanted spread of bamboo and other invasive species. The smooth surface of the Rhizome Barrier acts as a root stop, diverting the rhizome and preventing unchecked growth. The material cuts with a utility knife but is strong enough to resist root penetration. When used as a root block the tree must be 8' or more from the Bamboo Stop.