Clear Warning Message: Features bold black text on APWA-approved orange tape, clearly stating "CAUTION BURIED FIBER OPTIC CABLE BELOW. " Durable & Reliable: Made from resilient 0. 004" thick polyethylene, designed to withstand underground conditions. Buried detectable & non-detectable warning tapes, high visibility reflective laminated labels & flexible line marker posts, soil markers, domed posts. It acts as a clear visual signal to stop. Designed for the identification and protection of buried fibre optic networks, this underground warning tape is available in both standard and premium grades. It meets or exceeds all industry specs, and comes in a variety of.