Irwin Strait-Line Red Permanent Chalk Line Chalk, 5 lb. is designed for use with reel type chalkline boxes, making it an essential tool for marking precise lines on a variety of exterior surfaces including wood, drywall, concrete, stone, and metal. This chalk comes in a convenient plastic squeeze bottle with a fast fill spout, ensuring easy and mess- refilling. Its permanent red color produces long-lasting lines that resist fading, remaining visible even after weeks of exposure to weather and jobsite wear. I for professional and DIY projects, this chalk durability and reliability where clear, lasting marks are needed. Model Number: 65102