Pro-Line Safety manufactures non-detectable underground marking tapes to meet or exceed all industry standards. Non-Detectable underground marking tapes must be a minimum of 4.0 mils for the economy version and 6.0 mils in structural thickness for premium grade. All non-detectable underground marking tapes are made with a solid color, organic polyethylene film that utilizes big, bold, black lettering. Pro-Line’s non-detectable underground marking tapes can be printed in any language with any design or logo. Pro-Line manufactures up to 60” in width. Standard sizes are 3”, 4”, 6”, and 12”. Standard length is 1000 feet. Custom sizes and lengths are available.