INKZALL® Jobsite Markers feature tips with the ability to write through dusty, wet or oily surfaces. The marker tips are clog resistant and designed for writing on rough surfaces such as OSB, cinder block and concrete and the ink dries quickly to reduce smearing markings, without drying out quickly when the cap is left off. For added user convenience, the INKZALL® markers have a built-in hard hat clip for easy storage and access.