STEELMAN Yellow Tire Marking Crayons are a long-lasting, weather and fade-resistant material marker. Less messy than chalk and paint, these crayons contain no lead or zinc compounds and are ideal for a wide range of marking uses with their ability to write on a multitude of materials including rubber, metal, glass, and even wood. Wet or dry, smooth or coarse, these crayons will let you leave the marks you need to, where you need them with a high contrast and easy to see bright yellow color. Markings made are long lasting and semi-permanent able to withstand the elements yet still be easily rubbed away when no longer needed. Great for use when marking automotive or bicycle tire punctures for repair, outlining damage to outdoor or construction equipment, or on sports and recreational equipment.