What you get: Five (5) universal fountain pen converters — reusable ink fillers designed to let you use bottled inks with most cartridge-style fountain pens. Why you need them: Convert disposable cartridge pens to refillable use, reduce waste, and expand your ink choices. Having five converters means spare parts for multiple pens or replacements when cleaning. Key benefits: Universal compatibility: Fits most fountain pens that accept standard converters, so you can use bottled ink across different pen models. Durable construction: Made from high-quality materials that resist deformation, ensuring a reliable seal and longer life. Reliable ink absorption and flow: Designed for consistent ink intake and smooth delivery to the nib. Easy to clean: The interface can be removed quickly for flushing and maintenance, keeping ink colors pure and performance consistent. Cost-effective and practical: Reusable design reduces the need for disposable cartridges and is ideal for regular writers, students, and hobbyists. Typical uses: School and coursework: Keep a spare converter handy for exams, note-taking, or art classes that require different ink colors. Office and daily writing: Swap inks for professional documents or replace a used cartridge without buying a new pen. Calligraphy and sketching: Experiment with specialty inks and colors while maintaining smooth ink flow and easy cleaning between changes. Simple to use: Fill from a bottle, attach to your pen, and write. When needed, remove the interface to rinse and refill. Five converters provide flexibility for multiple pens or ink colors.