Pentel of America, Ltd. LR10B pen refill, 1.0 mm metal tip, red ink

Refill for EnerGel RTX pens

The Pentel LR10-B refill fits EnerGel RTX and EnerGel Deluxe retractable pens. It supplies red ink through a 1.0 mm metal tip. The acid-free formulation is archival safe for records that must last. Writers who prefer a bold line will find the width consistent across the page.

Replaces empty cartridges in compatible pens

Swap the refill when the original cartridge runs dry instead of discarding the pen barrel. The upgrade is worthwhile for anyone who writes daily and wants a smoother flow than standard ballpoint refills provide. Left-handed users benefit from the quick-drying liquid-gel ink that prevents smears. Buyers who need a different line width or ink colour must choose another model.

Consistent flow during long writing sessions

The liquid-gel blend keeps ink flowing evenly through the metal tip without skipping or globbing. Heat from extended use does not cause the ink to feather or bleed through standard paper. The 1.0 mm tip maintains its bold stroke from the first word to the last. Users who require finer detail for small annotations should select a narrower tip.