About this item Jumbo Black Markers: BIGTHUMB Black Jumbo Poster Markers is made with the highest-quality non-toxic, acid-free, no odor, no-leakage water-based acrylic ink that is waterproof, quick dry, long-lasting, and has a smooth ink flow. Each fat permanent marker conforms to ASTM d-4236 and EN-71 safety standards. The 5 pcs Permanent Jumbo Black Markers feature a 3-IN-1 NIB design(fine, medium, and jumbo). Different width switching from 3-15mm can be completed by changing the pen holding direction. The big black marker felt tip is not only durable but also allows the marker pen to produce smooth and even ink, hardly skipping or breaking lines. The thick black marker with a wide jumbo tip ensures extensive coverage, making these black markers ideal for large-scale projects and intricate designs. Elevate your artwork to a professional level with these high-quality black jumbo markers, perfect for artists and crafters who demand excellence. Multi-Surface Compatibility: These fat permanent markers are Versatile enough to be used on a variety of surfaces, including poster, sign, canvas, wood, paper, rock, and more. Unleash your creativity without limitations. The durable and reliable performance ensures that your creations maintain their brilliance over time.