About this item Jumbo Permanent Markers Set: SRUOLOC jumbo black markers are made with the highest-quality water-based acrylic ink. That is waterproof, quick dry, long-lasting, and smooth ink flow Safety First – Our acrylic paint markers are non-toxic, Each thick permanent marker meets ASTM d-4236 and EN-71 safety standards, are suitable for artists of all ages, working seamlessly on rock, fabric, glass, wood, plastic, paper, and more 3-IN-1 NIB: (fine, medium, and jumbo) The thick tip permanent markers felt wide tip is not only equipped with 3-IN-1 nib, but also allows the jumbo marker paint pen to produce smooth and even ink MULTI-SURFACE: Our permanent jumbo poster markers are versatile enough to be used on a variety of surfaces, ideal for wall-painting, posters, stone, ceramic, glass, wood, fabric, canvas, plastic, metal, resin, terracotta, seashell, and more The permanent acrylic markers black set is perfect for artists to use on DIY designs, arts, and crafts, and painting projects.