Thermal Erasable Pen Refills 3.4mm Ink Cartridges 10 Pack – Black Blue Dark Blue Universal Replaceable Plastic Inserts Smooth Clean Erasing Writing

Thermal Erasable Pen Refills 3.4mm Ink Cartridges 10 Pack – Black Blue Dark Blue Universal Replaceable Plastic Inserts Smooth Clean Erasing Writing
This 3.4mm thermal erasable ink cartridge refill set offers a versatile and clean solution for correcting writing mistakes. Each cartridge is crafted with thermosensitive microcapsule ink, allowing handwriting to vanish when exposed to heat above 60°C and reappear when cooled below -15°C, enabling repeated use without residue. The integrated pen-tail eraser utilizes friction-based heat for clean, crumb-free erasure that protects paper integrity. Featuring reliable ink flow for consistent writing, these universal 3.4mm refills are compatible with many fountain pens and come in a practical 10-piece set with black, blue, and dark blue options, providing a cost-effective and convenient alternative to traditional ink bottles.