The BRFN-10F is a plastic body Pilot refill that is found in the Dr. Grip pens as well as the Pilot Ageless and S20 executive pen. It’s a proprietary shape that only Pilot uses, which makes this refill difficult to swap out in place of another refill. The BRFN-10 is not sold in an extra fine model, for that you need to upgrade to the BRFN-30EF.
Pilot makes a higher end refill in the same shape: the BRFN-30F.
This refill is the metal version of the Pilot BRFN-10F. It uses Pilot Acro ink (an oil-based hybrid). This is a 0.7 mm refill, wher the BRFN-30M is a 1.0 mm refill. This pen is not commonly found included in pens but its rather sold as an upgrade for pens like the Pilot S20 and Dr. Grip.
This refill is the metal version of the Pilot BRFN-10M. It uses Pilot Acro ink (an oil-based hybrid).
The Pelikan 337 is a standard Parker-style G2 refill with a metal body. It adheres to ISO 12757-2 standard, which is the guideline for ballpoint pen refills.
The Pentel LRN7TL is the 0.7 mm version of the Energel Infree refill.
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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 any Pentel Energel. This refill is wide enough that it typically fit Japanese gel and rollerball pen bodies but not European ones. It is similar in size to a Pilot G2 refill.
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The LRN5 is a type of Pentel Energel gel refill (known as the LR refill) in a 0.5 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 liquid gel ink refill that will fit G2 rollerball pens, including any Pentel Energel. This refill is wide enough that it typically fit Japanese gel and rollerball pen bodies but not European ones. It is similar in size to a Pilot G2 refill.
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The Pentel EnerGel LRN5H is the multi-pen version of the Energel ink.
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Ohto 893NP is a small needletip ballpoint refill. It’s commonly used in Ohto’s slim pens (Horizon, Slim, etc.). The size is cross-compatible with the Pilot Hi-Tec-C Slim.
Ohto 895NP is a small needletip ballpoint refill. It’s commonly used in Ohto’s slim pens (Horizon, Slim, etc.). The size is cross-compatible with the Pilot Hi-Tec-C Slim.
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Ohto 897NP is a small needletip ballpoint refill. It’s commonly used in Ohto’s slim pens (Horizon, Slim, etc.). The size is cross-compatible with the Pilot Hi-Tec-C Slim.
The PR is the standard Fisher Space Pen refill. It’s the famous refill that has been sold with the Space Pen. It writes at any angle, underwater, and at a crazy temperature range: -30 degrees F to 250 degrees F.
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The Kaweco Soul is a traditional oil-based ballpoint refill in a D1 standard size.
The M22 is a small, proprietary ballpoint refill designed for Lamy pens. It is mostly seen on the Lamy Pico, a portable, expandable pen, but also works with the Lamy Scribble.
The Zebra 4C is a family of D1 sized refills.