Professional-grade high-visibility orange marking chalk designed for use in chalk line reels for maximum contrast layout, marking, and reference lines on construction, concrete, and carpentry projects. Manufactured by KESON with ProChalk formula in convenient 5-pound container for high-volume commercial and residential applications. This bright orange chalk creates exceptionally visible lines on concrete, asphalt, wood, and various surfaces where maximum visibility and contrast are essential for safety, accuracy, and efficiency.