The 65103 Strait-Line 5lb Yellow Chalk is what you need to help get things Strait. The Strait-Line chalk is great for outdoor use, carpentry, bricklaying, masonry, roofing,carpet installation,floor and wall tiling, painting, decorating and many other uses.  Yellow chalk is great for temporary lines that will disappear after a while. For more than 30 years, Strait-Line products have represented the standard for excellence and performance in marking tools.