These booklets fit into our refillable journals. This is not for the standard sewn leather wrap journals. If the title and description says "Refillable" or "bifold / trifold" anywhere, these will be compatible. PAPER INFO▸ Choose from blank, dot (5mm) or lined pages (5mm narrow ruled) ▸ Thick 80lb white paper▸ Fountain pen friendly paper▸ 48 pages per insert total▸ Pages are counted front and back (48 usable sides)▸ Acid free archival quality paper / ink will remain on page over time▸ Inserts are thread-bound by hand SIZE INFO: ‣ 4x6" (A6)‣ 5x7" (B6)‣ 6x8.5" (A5) ‣4.3x8.5 ("Standard")‣ 8x10" (B5) FAQ'sQ: Is the blank paper suitable for fountain pens?A: Yes! The paper is thick & of high quality. Bleed through and ghosting is very unlikely with pens including fountain, and most water based fineliner markers. Not for use with sharpies. Q: Can I use watercolor paints in my journal?A: You can do light washes, if you don't mind some warping. Many of my customers do this & are happy with the results - but this is not meant to replace a watercolor pad. Q: Do I have to use Forest Nine brand inserts with my journal cover?A: No! You can use many brands of inserts PROCESSING TIME & SHIPPING‣ Processing time is the amount of time I need to create your custom bookmark. Most items are handmade and shipped within 10 business days