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.