Custom Tomoe River S Refill Inserts & Book Blocks
Custom Tomoe River S Refill Inserts & Book Blocks
Tomoe River refill inserts and book block manufacturing is a contract service for paper products supplied without a finished outer cover. PUNDY (Since 1990) is a Taiwan-based notebook manufacturer that uses the current Tomoe River S paper made by Sanzen, in white 52 gsm and 68 gsm, to manufacture loose 6-hole refill inserts, book blocks supplied for subsequent casing-in, and center-stitched refill booklets designed to fit compatible notebook covers. Dot, grid, lined, or monthly planner layouts can be printed. It suits brands that already have their own leather covers, planners, or ring binders and want Tomoe River refills or book blocks made to their specifications.
Who is this service for?
Leather cover and planner brands
You already sell leather or fabric notebook covers and need Tomoe River inserts or book blocks that fit them and can be replaced over time.
Ring binder brands
You need loose 6-hole Tomoe River refills in A5, A6, or A7, printed with your own layouts.
Handmade and small-batch brands
You handle binding or packaging yourself and need Tomoe River pages with cutting, hole punching, or printing.
Brands changing their insert supplier
Some stationery brands reported variations in Tomoe River S paper performance in early 2025. More recent samples have shown improved consistency in tests reported by some brands, although results may still vary between production batches. If you are considering a new insert manufacturer, we recommend comparing Tomoe River S samples with your current paper to evaluate writing feel, show-through, and suitability for your intended finishing processes.
6-hole refill inserts, book blocks, and stitched refills
| Format | Description | Typical use |
|---|---|---|
| 6-hole refill inserts | Loose A5, A6, or A7 sheets with 6 holes; dot, grid, lined, or monthly planner printing available | Inserted into 6-hole ring binders and replaced when used up |
| Book blocks | Pages bound to your specified structure, supplied without a hardcover case | Cased in with your own cover; suitability for a removable cover depends on the spine and fastening method |
| Stitched refill booklets | Thin booklets sewn along the center fold | Used in compatible notebook covers, often several at a time |
Refill inserts require the actual trim size, number of holes, hole positions, and hole spacing, checked against the cover’s page capacity and ring size. Two systems labelled A5, A6, or A7 do not always share the same hole positions, so please send an existing insert or the ring specifications. Book blocks also require the binding structure and spine thickness. For complete notebooks with covers, see custom Tomoe River notebooks.
52 gsm or 68 gsm? Paper specifications and limits
Paper specifications
- Current Tomoe River S paper made by Sanzen, white.
- 52 gsm is very thin and suits high page counts without excess bulk.
- 68 gsm is PUNDY’s standard paper specification and offers a more substantial feel than 52 gsm.
Before you order
- Tomoe River S is a thin paper, so fountain pen writing may show through (writing visible from the back). Show-through is not the same as ink bleeding through to the back; both depend on paper weight, nib, ink, and writing style. PUNDY cannot guarantee that the paper will be free from show-through. We recommend testing paper samples with your intended pens and inks before confirming the specification.
- Full-bleed full-color printing is not recommended on 52 gsm; print content is reviewed first.
- For the practical difference between the two weights, see Tomoe River S 52gsm vs 68gsm.
Optional add-ons
Refill inserts or book blocks can be produced together with the following, so your order ships complete:
Notebook covers
Made to match the inserts or book block; genuine leather or other material options can be discussed and are confirmed by style and quotation.
Test sheets, brand cards, and boxes
Test sheets let your customers try their pens first; brand cards and packaging boxes can ship with the inserts.
What to include in your inquiry
- The paper size your cover holds and the size of your current insert; for 6-hole refills, the number of holes, hole positions, and hole spacing, ideally with a sample insert or photo of the rings
- Format: refill inserts, book blocks, or stitched refill booklets
- Paper weight (52 gsm or 68 gsm) and pages per unit; for book blocks, the binding structure and target spine thickness
- Page layout: blank, dot, grid, lined, monthly planner, or your own artwork (see notebook page layouts)
- Estimated quantity, and whether you need notebook covers, test sheets, brand cards, or boxes
FAQ
What is the difference between Tomoe River refill inserts and a book block?
Refill inserts are loose, hole-punched sheets used in ring binders. A book block is a set of pages bound to your specified structure but not yet cased in a finished cover, ready for your own cover. Both can be made with Tomoe River S paper.
Will 6-hole A5, A6, or A7 Tomoe River refills fit any binder?
Not necessarily. Binders with the same size name can have different hole positions and spacing. Send an existing insert, a photo of the rings, or the full hole specifications so PUNDY can check compatibility before confirming the specification.
Should I choose 52 gsm or 68 gsm Tomoe River paper?
52 gsm is thinner and suits high page counts; 68 gsm is our standard stock with a more substantial feel. Both may show through, so we recommend testing samples before deciding.
Does Tomoe River paper show through? Can it be printed in full color?
Tomoe River S is thin, so fountain pen writing may show through; show-through is different from ink bleeding through. PUNDY cannot guarantee that the paper will be free from show-through and provides samples so you can test with your own pens and inks. Full-bleed full-color printing is not recommended on 52 gsm, and print content is reviewed first.
Can you print our own layout on the refills?
Yes. Dot, grid, lined, monthly planner, or your own artwork can be printed; feasibility is confirmed based on paper weight and print content.
What is the MOQ?
Standard MOQ is 500 units per design. For loose-sheet refills, please also specify the number of sheets per set so we can confirm the applicable quotation unit.
Related pages
Need Tomoe River inserts made for your brand?
Tell us your cover size, format, paper weight, and estimated quantity, or request paper samples first. Standard MOQ is 500 units per design.
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