Molotow ONE4ALL Acrylic Paint Marker Set, 6 Neon Colors, 4mm (200.166) High-covering, premium acrylic-based pigment paint in an easy-to-handle marker that works on almost every surface, both indoors and outdoors Flowmaster pump marker system has patented capillary technology and is refillable Acrylic-based hybrid paint is UV and weather-resistant for highest opacity Solvent-free and dilutable with water or acetone and tips are exchangeable Colors include: Neon Yellow Fluorescent, Neon Orange Fluorescent, Neon Pink Fluorescent, Neon Green Fluorescent, Signal White and Signal Black