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Keson's Marking Chalk Refill is a premium-quality white chalk made in the USA and perfect for marking lines on pavement, concrete, and asphalt surfaces. This high-performance chalk refill comes in a convenient 5 lb bag and works perfectly with Keson self-chalking line reels, providing effortless line marking in various applications such as construction sites, sport fields, parking lots, and warehouses. The self-lubricating chalk eliminates the need for lubricants or additional oils and ensures clean and vibrant lines that are visible both indoors and outdoors. With its ease of use, durability, and precision marking capabilities, Keson's Marking Chalk Refill is an essential tool for professional contractors and DIY users alike. Buy it now and experience the difference of American-made quality!