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.

Strait-Line® Standard Marking Chalk Features

• Interior or exterior use
• Marks are temporary
• Provides great visibility