Inkzall, 4 pack, fine point, colored marker, feature clog resistant tips & ability to write through dusty, wet & oily surfaces, durable marker tips are designed for writing on rough surfaces such as osb, cinderblock & concrete, ink dries quickly to reduce smearing marks, without drying out quickly when the cap is left off, markers have a built in hard hat clip for easy storage & access, includes: black, red, blue & green colors. The durable permanent marker tips are designed for writing on rough surfaces such as OSB, cinderblock, and concrete, and the ink dries quickly to reduce smearing. The construction marker also has a built-in hard hat clip providing you with easy storage and access. You can leave the marker cap off for up to 72 hours and the fine tip will remain completely functional. Our MILWAUKEEยฎ INKZALLโข markers showcase our relentless mission to provide you with innovative solutions and commitment to best-in-class durability.