Bamboo Shield -150 Foot Long x 30 inch Width x 80 mil Bamboo Root Barrier/Water Barrier Controls growth of bamboo by limiting rhizome (root) expansion Made in the USA from High Density Polyethylene (HDPE). 80 mil material thickness that provides 155 pound-force puncture resistance Superior to metals because it will not rust and easier to install Protective side is chrome rolled to provide a better rhizome deflection surface.