Made of heavy-duty B-720 polyethylene material with overcoated graphics to protect the legend from acids, alkalis and other soil substances. Identoline® Underground Warning Tape is economical enough to use over entire length of the line when compared to the cost of line damage and is easily identified due to sharply printed legend on APWA color-coded background. Tape is 4.0 mils thick with a tough tensile strength of 1750 psi. Standard roll size is 6" W x 1,000 ft.