Product Description Marking chalk marks are temporary. Provides greater visibility in standard lighting conditions. Durable formula is weather-resistant and suitable for interior or exterior use. Use to show layout changes and corrections on metal, concrete, lumber, plastic, cardboard and other surfaces. IRWIN Tools STRAIT-LINE 65201 Standard Marking Chalk, 2.5-pound, Blue (65201) From the Manufacturer The 65201 Strait-Line 2.5lb Blue Chalk is what you need to help get things Strait. The Strait-Line 2.5lb blue chalk is great for indoor and outdoor use, carpentry, bricklaying, masonary, roofing,carpet installation,floor and wall tiling, painting, decorating and many other uses. The blue chalk is a temporary chalk that will disapear after a while. For more than 30 years, Strait-Line products have represented the standard for excellence and performance in marking tools. Marking chalk marks are temporary. Provides greater visibility in standard lighting conditions Durable formula is weather-resistant and suitable for interior or exterior use Use to show layout changes and corrections on metal, concrete, lumber, plastic, cardboard and other surfaces Package Dimensions: 23.62 L x 8.38H x11.68W(centimeters)