Non-detectable underground warning tape used in construction, turf and irrigation, CATV, utilities and pipeline contractors. The tape is buried 4 to 6 inches below the surface so that it is dug up prior to reaching a depth that could caude damage to the line or persons digging. Polyethylene film, 4 mil., 3 in. x 1000 ft. Ink color is black, permanently printed. APWA uniform color coded. Meets or exceeds industry standards. Sold by the case.