Irwin 64907 Hi-Visibility Marking ChalkIrwin 64907 Hi-Visibility Marking Chalk Features:; Exterior use; Ideal for low light conditions and on dark surfaces; Use to show layout changes and corrections; Weight: 8 oz; Color: Green Chalk - Hi-Vis; For all reel type chalk line boxes; For use on a variety of surfaces including wood, drywall, concrete, stone, and metal; Packaged in plastic squeeze bottles with fast-fill spout; Snap cap prevents spilling, keeps chalk dry; Plastic squeeze bottles