Duratech Marking Flags – Yellow (4″ × 5″ Flag, 30″ Wire Staff, 100 Flags) Duratech 4″ × 5″ vinyl marking flags with 30″ wire staff provide a durable and highly visible solution for marking utilities, survey points, construction layout, and site boundaries. Manufactured from weather-resistant vinyl and mounted on a flexible 30″ steel wire staff , these flags install quickly in soil, gravel, or turf and remain visible in demanding jobsite environments. Flags are sold in bundles of 100 , making them convenient for everyday surveying, construction, and utility locating work. Yellow marking flags identify gas, oil, steam, petroleum, and other gaseous materials according to APWA / One-Call underground utility color standards . Key Features • 4″ × 5″ survey flag on 30″ wire staff • Durable weather-resistant vinyl flag material • Flexible steel wire staff for easy ground placement • High-visibility color for quick identification • Sold in bundles of 100 flags