Fountain Pen Ink Cartridges, Heat Sensitive Replaceable Erasable Cartridges Pen Accessories, 3.4mm Bore Diameter (Dark Blue, 10pcs)

3.4mm Replaceable Ink Cartridge Thermal Erasable Pen Refill Replaceable Applicable Black/ Blue/ Dark Blue Pen Accessories
Feature:
Quantity: 10Pcs
Colour: Dark Blue
Material: Plastic
Product size: 5cm/1.97in
Package size: 10x5x4cm/3.94x1.97x1.57in
Netweight: 50g/0.11lb Gross weight: 50g/0.11lb Descrition: Thermal Erasable Technology：Crafted from thermosensitive microcapsule water-b ased color paste, our ink enables handwriting to v anish above 60°C and reappear below -15°C, supporting repeated writing and erasing without r esidue for hassle-free edits.
Physical Erasing Without C rumbs：The built-in pen-tail eraser uses frictional heat to remov e marks cleanly, leaving no c rumbs or paper damage—unlike chemical erasers that harm the paper surfaces, ensuring a tidy writing experience.
Sleek and Dependable Ink F low：Consistent, clear writing with low-volatility ink; if the nib dries after long storage, simply dip it in a nib moisturizer to r estore normal use quickly for dependable performance.
U niversal 3.4mm Replaceable Cartridges：Available in black, blue, and dark blue, these ink sac s are c ompatible with many f ountain pens, m aking refills convenient and cost-e ffective for long-term use without m essy ink bottles.
Double-Function Designs：The pen combines a writing nib and a erasing head, allowing seamless mistake correction by erasing and rewriting without extra tools—ideal for students, professionals, and daily use.
Package Content:
10x Ink Cartridge