The LRN3 is a type of Pentel Energel gel refill (known as the LR refill) in a 0.3 mm size. The LRN refills specifically refer to the needle-tip (aka needle-point) variety of the refill, with the number indicating the tip size. This is a wet gel ink refill that will fit G2 rollerball pens, including
Pentel 6pcs EnerGel LRN5 XLRN4 Needle-Point Gel Pen Refill - 0.5 mm/0.4mm Black/Blue/Red For Pentel BLN-75 - AliExpress
Pentel Energel Infree XLR Refill - Tokyo Pen Shop
Pentel Refill Ink for EnerGel Gel Pen, 0.5mm, Needle Tip, Green Ink, Box of 12 (LRN5-D)
Pentel New EnerGel Deluxe RTX Retractable Liquid Gel Pen,Ultra Micro Point 0.3mm, Fine Line, Needle Tip, Black Ink Value set of 10
Pentel Refill Ink for EnerGel Liquid Gel Pen, 0.5mm, Needle Tip, Black Ink, Box of 12 (LRN5-A-12) : Office Products
EnerGel Liquid Gel Pen Refill, 0.3mm Needle Tip – Pentel of America, Ltd.
Pentel Refill Ink for EnerGel 0.7mm Needle Tip Liquid Gel Pen, Pack of 12 (lrn7-a-12)
PENTEL JAPAN XLRN3-A LRN3 Energel Refill 0.3mm Black ink Needle Tip #10 pcs SET
Pentel EnerGel Pearl Retractable Liquid Gel Pen
Uni-ball Signo UMR-1 Gel Pen Refill
Tip : needle tip. Super-smooth and quick-drying liquid gel ink ! Quantity : 10 pcs SET. Ink Color : Red. Ink : gel-ink. Point : 0.3 ㎜. We do not
PENTEL JAPAN XLRN3-B LRN3 Energel Refill 0.3mm Red ink Needle Tip #10 pcs SET