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 thatyou 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
Irwin® Strait-Line® 64902 Permanent Marking Chalk Refill, Permanent, Container Size: 8 oz, Container Type: Bottle, Red, Composition: Calcium Carbonate, Red Iron Oxide, Silica (Crystalline Quartz), Form: Powder