This ink refill bottle from rOtring is perfect for your black drawing pen. The bottle has a capacity of 23 ml, making it a convenient and practical option for everyday use. It is made from high-quality ink material, ensuring that your pens will write smoothly and effectively. This product is suitable for collectors and enthusiasts alike, and is a must-have for anyone who loves to draw or write. Whether you are using it for professional or personal use, this ink refill bottle is sure to provide you with a reliable and long-lasting experience.