Hi-Vis/Fluorescent Formula: Specially engineered in fluorescent orange to provide excellent visibility for exterior layout tracking on dark substrates like asphalt, deeply weathered timber, or heavy metal framing. It is highly useful for calling out quick layout changes and corrections.

Surface Versatility: Clings evenly onto self-chalking line reels and snaps clean lines over wood, concrete, stone, metal, and drywall.

Airtight Bulk Jug: Supplied in a rugged 5 lb. bulk container featuring an advanced flip-top cap. The cap seals the chalk inside an airtight chamber, locking out job-site humidity and mitigating the risk of damp line clumping.