Strait-Line 65104 5lb White Chalk
The 65104 Strait-Line 5lb White 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. White is a good color to use for temporary lines 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.