IRWIN Chalk Indigo Blue 4 lb. #4 Permanent

Irwin Strait-Line Permanent Staining Marking Chalk
Great for extreme outdoor conditions because it can withstand harsh weather conditions and months of jobsite wear.
Flip-cap keeps the chalk in the bottle where you want it and stops it from spilling out in areas that you don’t.
Flip-top cap also seals the chalk in an airtight chamber, keeping out moisture and reducing the risk of clumping.