Sharpie does not offer refillable pen models, which means that once a Sharpie pen runs out of ink, it cannot be refilled. Instead, customers can purchase new pens when they are dry. However, Sharpie does provide a variety of pen types, including permanent markers, fabric markers, and other specialty pens, each designed for different uses and applications. Each of these products comes with its own ink supply, and while replacement options may not be available for the pens themselves, customers can explore the wide selection of Sharpie products to find what best suits their needs. For more specific information or to find product availability, it is advisable to check the official Sharpie website, which may provide additional insights on products and usage.