Water-Based Ballpoint Pen Refill - Made in Japan Quality: Crafted with the precision and care synonymous with Japanese manufacturing, ensuring high-quality performance. - Advanced Ceramic Ball Tip: Utilizes a ceramic ball in the pen tip, offering rust-free durability and consistently smooth writing. - Innovative Cap-Free Design: Features a unique structure that eliminates the need for a cap, significantly reducing the likelihood of the ink drying out. - Lightweight and Compact: Each refill weighs 9g and measures 111mm x 6mm, making it easy to carry and store. - Optimized for Ease of Use: Developed to provide a hassle-free writing experience, ideal for everyday use in a variety of settings.