Irwin Strait-Line Orange Hi-Visibility Chalk Line Chalk, 5 lb. is specially designed for use with reel type chalkline boxes, making it a reliable choice for marking straight lines on a variety of surfaces. This chalk is packaged in a convenient plastic squeeze bottle with a fast fill spout, allowing for easy and mess- refilling. Its vibrant orange color is i for exterior applications and performs exceptionally well in low light conditions or on dark surfaces such as wood, drywall, concrete, stone, and metal. With a permanence scale rating of 2, it a balanced level of durability for most marking needs, ensuring your lines remain visible without excessive residue. This 5-pound bottle provides ample quantity for extended use, making it a practical option for professionals and DIY enthusiasts alike. Model Number: 65105