{"product_id":"zebra-cjk-0-5-gel-pen-refill-10-pack-05mm-japan-black-red-ink","title":"Zebra CJK-0.5 Gel Pen Refill 10-Pack – 0.5mm Japan | Black \/ Red Ink | Compatible with Zebra Sarasa Clip C-JJ6 \u0026 JJ15","description":"\u003ch2\u003eZebra CJK-0.5 Gel Pen Refill 10-Pack – 0.5mm Japan | Black \/ Red Ink | Compatible with Zebra Sarasa Clip C-JJ6 \u0026amp; JJ15\u003c\/h2\u003e\n\n\u003cp\u003eThe right refill for the right pen. The \u003cstrong\u003eZebra CJK-0.5 gel ink refill\u003c\/strong\u003e is the genuine Japan-produced replacement cartridge for Zebra’s \u003cstrong\u003eSarasa Clip C-JJ6\u003c\/strong\u003e range and other Zebra pens using the CJK cartridge format. Each refill contains Zebra’s \u003cstrong\u003ewater-based gel ink\u003c\/strong\u003e at a \u003cstrong\u003e0.5mm ball diameter\u003c\/strong\u003e — 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 \u003cstrong\u003eBlack and Red\u003c\/strong\u003e, sold in a \u003cstrong\u003e10-pack\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003cp\u003eSame pen. Fresh ink. Keep writing.\u003c\/p\u003e\n\n\u003ch3\u003e✏️ Product Highlights\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Zebra (Japan)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e CJK-0.5\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePack:\u003c\/strong\u003e 10 refills of the same ink colour\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTip size:\u003c\/strong\u003e 0.5mm ball — fine line, precise writing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInk type:\u003c\/strong\u003e Water-based gel ink — smooth flow, vivid colour, quick-drying on standard paper\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInk colours available:\u003c\/strong\u003e Black \/ Red (select above)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary compatibility:\u003c\/strong\u003e Zebra Sarasa Clip C-JJ6 (including the multi-colour rainbow barrel variants)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAlso compatible with:\u003c\/strong\u003e Other Zebra pens accepting the CJK cartridge format — see compatibility notes in the FAQ\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e🇯🇵 Genuine Zebra Japan – Why the Origin Matters\u003c\/h3\u003e\n\u003cp\u003eZebra’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:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConsistent flow:\u003c\/strong\u003e The ink starts on the first stroke without requiring priming or warming, and maintains consistent flow without skipping or blobbing across the full cartridge life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccurate 0.5mm line:\u003c\/strong\u003e The ball diameter and seat are matched to Zebra’s specification — the 0.5mm line is reliably 0.5mm, not 0.6mm or varying. Consistent line width matters for note-taking legibility and exam answer formatting.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo pen damage:\u003c\/strong\u003e Genuine Zebra refills are dimensionally identical to the original cartridge, ensuring correct seating in the tip mechanism without wear, misalignment, or leakage that can occur with incompatible third-party refills.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e📝 0.5mm Gel Ink – The Note-Taking Standard\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e0.5mm ball diameter\u003c\/strong\u003e is the optimal specification for handwritten note-taking in the majority of contexts:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFine enough\u003c\/strong\u003e for small, dense handwriting on A4 or B5 ruled paper without the line width crowding the writing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecise enough\u003c\/strong\u003e for exam answer booklets, official forms, and any writing where legibility under reduced-size reproduction is required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGel ink advantage:\u003c\/strong\u003e At 0.5mm, gel ink produces a richer, more saturated line than ballpoint at the same width — more readable at a glance, requiring less writing pressure, and reducing hand fatigue in long writing sessions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e📦 What’s in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e10 × Zebra CJK-0.5 gel ink refills in your selected colour (Black or Red)\u003c\/li\u003e\n  \u003cli\u003eOriginal Zebra Japan packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eQ: Which Zebra pens is the CJK-0.5 refill compatible with?\u003c\/h3\u003e\n\u003cp\u003eA: The CJK-0.5 is the \u003cstrong\u003estandard refill for Zebra Sarasa Clip C-JJ6\u003c\/strong\u003e 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 \u003cstrong\u003eJJ15 Sarasa Clip\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eQ: What is the difference between CJK-0.5, JK-0.5, and NJK-0.5?\u003c\/h3\u003e\n\u003cp\u003eA: These are Zebra’s refill format designations for different pen families:\u003cbr\u003e\n\u003cstrong\u003eCJK-0.5\u003c\/strong\u003e — for Sarasa Clip C-JJ6 and compatible CJK-format pens (shorter cartridge).\u003cbr\u003e\n\u003cstrong\u003eJK-0.5\u003c\/strong\u003e — for Sarasa Clip JJ15 and compatible JK-format pens (longer cartridge).\u003cbr\u003e\n\u003cstrong\u003eNJK-0.5\u003c\/strong\u003e — for Sarasa Grand and other NJK-format pens (premium barrel series).\u003cbr\u003e\nThese formats are \u003cstrong\u003enot interchangeable\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003ch3\u003eQ: How many pages does each CJK-0.5 refill last?\u003c\/h3\u003e\n\u003cp\u003eA: 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 \u003cstrong\u003eseveral weeks of regular daily use\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eQ: Is the ink water-resistant once dry?\u003c\/h3\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch3\u003eQ: How do I install the CJK-0.5 refill in my Zebra Sarasa Clip?\u003c\/h3\u003e\n\u003cp\u003eA: To replace the refill in a Zebra Sarasa Clip C-JJ6: \u003cstrong\u003e(1)\u003c\/strong\u003e Unscrew or pull apart the pen barrel at the grip section. \u003cstrong\u003e(2)\u003c\/strong\u003e Remove the spent CJK refill cartridge by pulling it out of the tip. \u003cstrong\u003e(3)\u003c\/strong\u003e Insert the new CJK-0.5 refill with the ball tip facing the pen nib end. \u003cstrong\u003e(4)\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eQ: Does the red ink smear when highlighter is applied over it?\u003c\/h3\u003e\n\u003cp\u003eA: Zebra gel ink is \u003cstrong\u003equick-drying on standard paper\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eQ: Can I use this refill in non-Zebra pens?\u003c\/h3\u003e\n\u003cp\u003eA: 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 \u003cstrong\u003eZebra does not certify compatibility outside its own pen range\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003ch3\u003eQ: Why buy a 10-pack rather than individual refills?\u003c\/h3\u003e\n\u003cp\u003eA: A 10-pack provides a \u003cstrong\u003elower per-refill cost, fewer repeat orders, and an uninterrupted supply\u003c\/strong\u003e 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.\u003c\/p\u003e","brand":"Zebra","offers":[{"title":"Black","offer_id":56101705810225,"sku":"CJK-0.5","price":11.0,"currency_code":"USD","in_stock":true},{"title":"Red","offer_id":56101705842993,"sku":"CJK-0.6","price":11.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0804\/2630\/3793\/files\/CJK-05-REFILLS1.jpg?v=1788452292","url":"https:\/\/www.ttpen.com\/products\/zebra-cjk-0-5-gel-pen-refill-10-pack-05mm-japan-black-red-ink","provider":"TTpen","version":"1.0","type":"link"}