- Double-head design with a round nib (1-5 mm) for large areas and detailed work, and a 1 mm fine nib for outlining contours and fine lines. This covers multiple coloring needs with one pen. - Upgraded cotton nibs and ready-to-use performance. No pressing required. The pen uses opaque water-based ink that is bright and full, waterproof, odorless, quick-drying, and provides strong coverage. - 36 bright colors with color-matched caps for easy selection. Quickly grab your desired color and capture ideas without guesswork. - Versatile on a wide range of surfaces. Suitable for smooth and porous materials, including rocks, wood, canvas, fabric, glass, plastic, paper, ceramics, and metal. - Practical use scenarios: - Craft projects on rocks, wood, and canvas, combining bold backgrounds with precise detailing. - Personalizing fabric items, scrapbooks, greeting cards, and other textiles. - Decorating and labeling glass jars, ceramics, metal, and plastic objects for home or gifts.