2 pack, black, fine point Markers, clog resistant marker tip, writes through dusty, wet oily surfaces, durable marker tip are designed for writing on tough surfaces such as osb, cinderblock concrete, ink dries quickly to reduce smearing markings, without drying out quickly when the cap is left off. 2 pack black Clog resistant marker tip Writes through dusty, wet oily surfaces Designed for writing on tough surfaces such as osb, cinderblock concrete