Replaceable Calligraphy Fountain Pen Cartridges, 3.4mm, Posture Correction, Blue/Black/Red Ink

Enhance your writing experience with these versatile calligraphy fountain pen cartridges, designed with a 3.4mm nib for precision and elegance. These cartridges feature posture correction technology, promoting optimal hand positioning for improved handwriting comfort and quality. Available in three classic ink colors—blue, black, and red—they allow you to personalize your notes and artistic projects. Designed for easy replacement, these cartridges ensure your writing instrument is always ready for your creative needs, delivering smooth, consistent ink flow for exceptional results every time. Ideal for artists, students, and professionals alike. Shell material: Plastic Specification: 3.4mm Ink supply system: Ink sac Nib material: Iridium Manufacture country: China Instructions included: No