The Non-Detectable Underground Tape is IDEAL® for the protection, location and identification of underground utility installations! It is formulated to resist degradation from acid and alkali found in soils, and utilizes lead-free pigments and organic lead-free ink. Tape has LDPE construction for high strength and durability. Recommended burial depth for 3 in tape between 4 to 6 in. Recommended burial depth for 6 in tape less than 12 in.