INKZALL jobsite markers feature clog resistant tips and the ability to write through dusty or oily surfaces. The durable marker tips are designed for writing on rough surfaces such as black pipe and structural steel. Proprietary ink dries quickly to reduce smeared markings, without drying out quickly when the cap is left off. INKZALL markers confirm to Milwaukee's commitment to best-in-class durability and their relentless mission to provide innovative solutions to the end user.