SMI-Carr Blue 6-inch Stake Chaser(R) brand marking Whiskers(R) are trusted for their durability and flexibility. Designed to provide maximum visibility and withstand multiple passes of a grader blade, our first product is perfect for road construction. Over the years, however, these safe and easy-to-spot ground marking whiskers have also become a prime choice for marking buried utility lines, survey points, and even athletic fields.