Irwin Strait Line Chalk Refills

High visibility chalk for self chalking line reels. For use on a variety of surfaces including wood, drywall, concrete, stone, and metal. Permanent colors, especially black and red, produce long lasting lines that won't fade. Chalk containers are filled by weight, not volume. Temporary colors, especially white and blue, provide high visibility and are easy to remove. Proprietary formulations for dark, sharp lines and reliable performance. Chalk containers are filled by weight not volume. Sold in 4 oz. (6 bottles), 8 oz. (6 bottles) & 5lb (1 bottle) sizes.