Marking Flags Fluorescent Lime 4" x 5" Flag with 21" Plastic Staff (1000 Flags)4" x 5" x 21" Fluorescent Lime Plastic Staff Marking Flags are ideal for above ground marking in a variety of industries. From utility construction to line locating, hardware to forestry, landscaping and lawn care to pet containment - these flags ensure consistent communication and long-lasting visibility for your project.