Keson 105GO Marking Chalk, Glow OrangeHighlights: 5Lb Refill Color Glow Orange Standard grade marking chalk formulated to achieve a perfect line every time with 45 strikes usual line yield. Brilliant color tones provide strong, sharp lines. Great flow for easy reel fill up. WARNING: This product can expose you to chemicals including Silica, crystalline, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.