Description: Convenient Essentials: Say goodbye to the hassle of ink bottles. Our black or blue replacement ink cartridges make it easy to switch. Refilling your pen with these cartridges is a for breeze, eliminating the need for cleaning. Designed specifically for pens equipped with DS-7158 ink cartridges, they provide a practical and clean solution for all your writing needs. Plenty of Supplies: You will receive 20 DS-7158 pen ink cartridges. With these ample replacement ink cartridges, you’ll have more than enough for your daily writing or backup needs. These versatile ink cartridges cater to various needs, ensuring you never run out of ink when you need it most. Please check compatibility with your pen before purchasing. Quick-Drying: Our pen ink cartridges use quick-drying ink to keep important writing moments clean and stain-free. The ink dries in seconds, preventing accidental stains. Each refill delivers rich, smudge-free color, whether you're writing letters or creating bold calligraphy strokes. Ensure your important writing moments aren't ruined by stains. for Ultra-smooth: The fountain pen ink cartridge ensures smooth ink flow without interruption or clogging, allowing your pen to glide effortlessly across the paper. The result is smooth and precise lines, enhancing your writing experience and making writing both enjoyable and satisfying. User-friendly operation: We designed these ink cartridges with user-friendliness and convenience in mind. Simply press the cartridge into the refillable fountain pen until you hear a “click” to confirm proper installation. No complicated steps or hassle—just a simple and convenient replacement process, allowing you to focus on writing. Specification: Color: As Shown. Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package Includes: ink sac*4