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.