The Milwaukee Inkzall Permanent Markers (48-22-3104) have been specifically designed to meet the demands of jobsite conditions. These markers feature a durable tip that can withstand writing on rough surfaces like OSB, cinderblock, and concrete. Additionally, they are capable of writing through dusty, wet, or oily contamination. The markers also come with a convenient hard hat clip, allowing them to be easily attached to the brim of hard hats for quick and easy access. With a clog-resistant tip, these markers are perfect for writing on dusty, wet, and oily surfaces, and their optimized design makes them ideal for rough surfaces. Furthermore, the markers have a quick dry time, reducing the chances of smearing markings. They come in a fine point and are filled with black permanent non-toxic ink. If you're looking for reliable and high-quality markers, be sure to check out the Milwaukee Inkzall Permanent Markers.