Pentel EnerGel Refills 0.5 Black, LRN5 LRN5BP2A Liquid Gel Ink, Pack of 2. Pentel Energel Refill LRN5, Black Ink, 0.5mm fine point needle tip. Fits the following pens: EnerGel Deluxe RTX, EnerGel Deluxe, EnerGel-X and EnerGel Alloy RT or any refillable EnerGel liquid gel pen. High performance ink technology combines the best qualities of liquid and gel inks for a super smooth writing experience. Liquid gel ink dries so fast even left-handed writers love it - no smears, no smudges, no globs.