Irwin 64908 Strait-Line® Black Permanent Marking Chalk, 8oz Bottle

IRWIN® STRAIT-LINE® marking chalks have a newly engineered flip-top cap that keeps the chalk in the bottle where you want it and stops it from spilling out in areas that you don.t. The flip-top cap, available on all IRWIN STRAIT-LINE chalk bottles, seals the chalk in an airtight chamber, keeping out moisture and reducing the risk of clumping. Permanent marking chalk is visible after weeks of weather exposure and job site wear, mainly used for exterior.