Detectable Underground Tape, 3 In Roll Width, 1000 FT Roll Length, Caution Buried Electric Line Below Legend, Solid Aluminum Foil Core, Red, Thickness: 5 Mil, Elongation: 80 PCT Astm D882-75B, Composition: Ideal Specs: Bottom Layer Pe, Top Layer Pet, Foil Industry Standard, Tensile Strength: 35 LB/In (15000 Psi) Astm D882, For Protection, Location and Identification Of Underground Utility Installations