Keep your permanent markers writing like new with this high-quality 15 ml red ink refill. Designed for smooth, consistent flow, this ink ensures bold, sharp lines on a variety of surfaces including paper, cardboard, metal, glass, and plastic. Its fast-drying, smudge-resistant formula provides a professional finish for both home and office use. Ideal for artists, crafters, students, and professionals, this ink is a convenient and cost-effective way to extend the life of your favorite permanent markers.