Mark buried cables and lines to communicate to workers where it may be dangerous to dig. These color-coded vinyl flags are durable and can be printed with your company's information and branding. Standard Flag Material: 4 mil vinyl. Standard colors: red, orange, yellow, green, blue, white. Preprinted, blank, or custom. Packaging: 1,000 flags per case. Choose from 18", 21", 24", 30" and 36" 15.5 gauge steel wire metal staff. Also available with plastic staffs.