Pentel of America, Ltd. LR10C Refill Pen, Blue, 1.0 mm

Refill for EnerGel RTX pens

The Pentel LR10C is a blue ink refill cartridge designed specifically for retractable EnerGel liquid gel pens. It features a metal tip and delivers super-smooth liquid gel ink in a bold 1.0 mm line width. The acid-free, archival safe ink formulation resists fading over time. This new refill restores writing performance to compatible pens instantly.

For EnerGel RTX and Deluxe owners

This refill suits anyone with a compatible Pentel EnerGel RTX or EnerGel Deluxe pen who needs a bold blue replacement cartridge. It matches the original metal tip design and 1.0 mm line width for consistent results. Buyers who need a finer line width or a different ink colour should look at alternative refill models. Those using other pen brands entirely cannot use this cartridge.

Metal tip with 1.0 mm bold line

The single specification that decides fit is the metal tip combined with the 1.0 mm bold point size, which must match the original refill in your EnerGel RTX or Deluxe pen. Using a different tip material or point size changes the writing feel and line quality significantly. Verify your current refill shows the LR10C or compatible model number before purchasing. This ensures the refill seats correctly and performs as intended.