Molotow One4All Acrylic Markers Neon 1.5mm 127HS Extra Fine Set of 6 Optimized for rough surfaces like stone, concrete, leather, tile, wood, glass, plastic Permanent acrylic-based hybrid paint (UV and weather resistant) 1.5 mm tip size The refillable markers feature Molotow's patented Flowmaster pump-valve that ensures a continuous ink flow for quick application. Neon Colors, Sets of 6 - These sets include one each of Neon Green Fluorescent, Neon Orange Fluorescent, Neon Pink Fluorescent, Neon Yellow Fluorescent, Signal Black, and Signal White.