Kit Contents. Sidewalk Sign Kit comes with one set of 421 - 5 inches letters, numbers, and symbols (black letters & red numbers). Anti-Slip. Four anti-slip rubber feet (on the bottom of the uprights) keep the sign firmly in place when on the sidewalk. Stability. The gentle swing motion attracts attention while providing resistance to winds in excess of 30 mph. For added stability in windy conditions fill the ballast ports (located at the base of the uprights) with water or sand. Made In USA. All components are made in the USA and offer superior quality. Sidewalk Sign with Letters. Customize your own message easily with one of the most suitable sidewalk signs for businesses.