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The right refill for the right pen. The Zebra CJK-0.5 gel ink refill is the genuine Japan-produced replacement cartridge for Zebra’s Sarasa Clip C-JJ6 range and other Zebra pens using the CJK cartridge format. Each refill contains Zebra’s water-based gel ink at a 0.5mm ball diameter — the standard fine-line specification for note-taking, exam writing, and everyday use that demands a clean, consistent ink line with minimal hand fatigue. Available in Black and Red, sold in a 10-pack for sustained supply without repeat ordering. Keep the pens you already use. Replace only the ink. The CJK-0.5 is the refill that makes Zebra’s gel pen body a long-term investment rather than a disposable product.
Same pen. Fresh ink. Keep writing.
Zebra’s gel ink formulation is produced to Japanese manufacturing standards — tighter quality tolerances for ink viscosity, ball-seat fit, and ink reserve volume than generic or third-party alternatives. The practical difference in daily use:
The 0.5mm ball diameter is the optimal specification for handwritten note-taking in the majority of contexts:
A: The CJK-0.5 is the standard refill for Zebra Sarasa Clip C-JJ6 pens, including all barrel colour and multi-colour (rainbow) variants of the C-JJ6 range. It is also compatible with other Zebra pens that accept the CJK cartridge format, including the JJ15 Sarasa Clip and other Sarasa series models using the same cartridge standard. If you are unsure whether your specific Zebra pen accepts the CJK refill, check the pen barrel or the Zebra product page for the cartridge type listed.
A: These are Zebra’s refill format designations for different pen families:
CJK-0.5 — for Sarasa Clip C-JJ6 and compatible CJK-format pens (shorter cartridge).
JK-0.5 — for Sarasa Clip JJ15 and compatible JK-format pens (longer cartridge).
NJK-0.5 — for Sarasa Grand and other NJK-format pens (premium barrel series).
These formats are not interchangeable. Using the wrong refill format risks incorrect seating, leakage, or inability to fit. Check the refill format listed on your pen or its original refill packaging before purchasing.
A: Ink longevity depends on writing pressure, character size, and writing density. Under typical student note-taking conditions (standard-size handwriting, moderate pressure, A4 ruled paper), a single CJK-0.5 cartridge provides several weeks of regular daily use before running out. The 10-pack provides a supply sufficient for an extended school term for a single-pen user, or a shorter period for a multi-pen user who rotates colours frequently.
A: Zebra’s water-based gel ink has moderate water resistance once fully dry on standard paper — it does not smear or run immediately on contact with moisture after drying. It is not fully waterproof and should not be considered permanent ink. For applications requiring fully waterproof ink (e.g., labels, outdoor use, archival documents), a pigment-based ink pen is recommended.
A: To replace the refill in a Zebra Sarasa Clip C-JJ6: (1) Unscrew or pull apart the pen barrel at the grip section. (2) Remove the spent CJK refill cartridge by pulling it out of the tip. (3) Insert the new CJK-0.5 refill with the ball tip facing the pen nib end. (4) Reassemble the barrel and click the pen to extend the tip — the ink should flow immediately on the first stroke. No priming or break-in is required with a genuine Zebra refill.
A: Zebra gel ink is quick-drying on standard paper and is resistant to smearing from most highlighters once the ink has dried (typically within a few seconds of writing). Oil-based highlighters pose no smear risk. Water-based highlighters may slightly affect the ink if applied immediately after writing before the ink has fully set. Allow a few seconds after writing before highlighting, and the ink will not smear under standard highlighter use.
A: The CJK-0.5 cartridge is dimensioned for Zebra’s CJK-format barrel and tip mechanism. Some third-party pens with compatible cartridge dimensions may accept the CJK refill, but Zebra does not certify compatibility outside its own pen range. Using a Zebra refill in a non-Zebra pen may work in practice, but incorrect seating can cause leakage or performance inconsistency. For guaranteed performance, use the CJK-0.5 in the Zebra pens it is designed for.
A: A 10-pack provides a lower per-refill cost, fewer repeat orders, and an uninterrupted supply of ink for pens in regular daily use. For students who use a Sarasa Clip as their primary writing pen, running out of ink mid-exam or mid-lecture is a disruption a 10-pack prevents entirely. For users who rotate between black and red (e.g., annotation systems where red marks corrections and black writes main content), maintaining a 10-pack of each colour ensures neither colour runs out at an inconvenient time.
