This dual-color bullet tip permanent marker is built for tough, professional marking, combining two vibrant colors in one convenient tool. Both clog-resistant 1.0mm tips deliver bold, highly visible lines on a wide range of surfaces—including dusty, oily, or rough industrial materials like metal, wood, brick, concrete, and cinder blocks. Ideal for multi-surface labeling, signage, technical marking, check marking, and quality control in manufacturing and inspection processes, it allows users to switch colors instantly for added efficiency. Quick-drying, water-resistant, and long-lasting, the permanent ink prevents smudging and ensures clean, precise marks. With a 72-hour cap-off design, this dual-head marker stays ready for continuous use, making it perfect for engineers, designers, construction workers, manufacturing operators, laboratory technicians, and healthcare professionals across workshops, job sites, studios, laboratories, medical environments, and industrial facilities.