---
product_id: 543394721
title: "Kokuyo B4 (9.8 × 13.9 inches) KB Paper, 5 Ream (2500 Sheets), 64gsm, 80 Bright - Perfect for Legal documents, Technical Manuals and Research Papers- FSC Certified, Japan Import (KB-L31TN)"
brand: "kokuyo"
price: "¥86196"
currency: JPY
in_stock: true
reviews_count: 12
category: "Kokuyo"
url: https://www.desertcart.jp/products/543394721-kokuyo-b4-9-8-13-9-inches-kb-paper-5
store_origin: JP
region: Japan
---

# FSC certified – eco-conscious premium paper 64gsm weight – ideal balance of thickness & portability B4 size (9.8×13.9 in) – perfect legal & technical docs Kokuyo B4 (9.8 × 13.9 inches) KB Paper, 5 Ream (2500 Sheets), 64gsm, 80 Bright - Perfect for Legal documents, Technical Manuals and Research Papers- FSC Certified, Japan Import (KB-L31TN)

**Brand:** kokuyo
**Price:** ¥86196
**Availability:** ✅ In Stock

## Summary

> 📄 Elevate your paperwork game with Kokuyo B4 – where precision meets sustainability!

## Quick Answers

- **What is this?** Kokuyo B4 (9.8 × 13.9 inches) KB Paper, 5 Ream (2500 Sheets), 64gsm, 80 Bright - Perfect for Legal documents, Technical Manuals and Research Papers- FSC Certified, Japan Import (KB-L31TN) by kokuyo
- **How much does it cost?** ¥86196 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/543394721-kokuyo-b4-9-8-13-9-inches-kb-paper-5)

## Best For

- kokuyo enthusiasts

## Why This Product

- Trusted kokuyo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smooth Ink Flow:** Optimized surface prevents feathering and bleed-through for flawless fountain pen and marker use.
- • **Sustainably Sourced:** FSC certification guarantees responsible forestry, aligning with your eco-conscious values.
- • **Archive-Grade Durability:** Acid-free, neutral pH paper ensures your critical documents stay pristine over time.
- • **Eye-Friendly 80 Brightness:** Soft off-white tone reduces eye strain during long reading or writing sessions.
- • **Precision-Perfect B4 Format:** Strikes the ideal size balance for professional documents and manuals.

## Overview

Kokuyo B4 KB Paper offers 2500 sheets of premium 64gsm, 80 brightness paper in a versatile B4 size (9.8×13.9 inches). Designed for legal documents, technical manuals, and research papers, it features acid-free, neutral pH composition for long-term preservation. Its smooth finish supports all pen types without bleed-through, while FSC certification ensures environmentally responsible sourcing. Imported from Japan, this paper balances professional quality with eco-conscious values, perfect for millennial managers who demand both performance and sustainability.

## Description

desertcart.com : Kokuyo B4 (9.8 × 13.9 inches) KB Paper, 5 Ream (2500 Sheets), 64gsm, 80 Bright - Perfect for Legal documents, Technical Manuals and Research Papers- FSC Certified, Japan Import (KB-L31TN) : Office Products

Review: Watercolor works great on this paper - I LOVE this paper! I started using this paper to make my own A5 planner since my perfect-for-me planner didn’t exist. Paper prints easily off my cheap printer for my planner sheets and doesn’t clog the machine. I love how highlighters look vibrant and true to color on this paper too. The paper is slightly thicker than 52 gsm tomoe river paper but thinner than regular printer paper. If you love watercolor as much as I do, this paper works well, blends colors easily, layering is great, and can handle wetter paint (whereas the 52 gsm tomoe river paper dries too quickly and can’t do super wet water washes). There is no bleed thru of the watercolor paints. You will still see and feel some crinkling but not as bad as the tomoe river paper. I’ll add some blank pages in the back of my planner just for watercolor sketches. I think this paper is worth it!
Review: GREAT paper for fountain pens. - I use this paper to make custom inserts and note pads for my Midori Traveler's Notebook. I make calendars, lined paper, dot grid, and graph. It has a coating on it that prevents bleed-through and ghosting of fountain pens. It has a great feel as well. It feeds through my laser printer with no problem, although there is an occasional creased page when printing both sides, I would say this is less than 5% of the time. At 64 gsm this paper is thinner than "typical" copy paper, which means in space-conscious applications like portable notebooks it works well where you can get more pages into the same thickness. The thinness doesn't feel like "cheapness" at all. I would call the color of this paper "cream". It is a pleasing color, but definitely not white. Overall, I couldn't be happier with this paper.

## Features

- Professional B4 Format: Each ream includes 500 sheets of 64 gsm paper in B4 size (364 × 257mm), striking the perfect balance between A3 and A4 formats. Ideal for legal documents, technical drawings, and detailed documentation
- Versatile Professional Applications: This high-grade paper excels in creating technical manuals, legal documents, and research papers. The off-white shade (80 Bright) reduces eye strain during extended reading while maintaining excellent contrast for both handwritten and printed content
- Archive-Grade Preservation: Each sheet features neutral pH and acid-free composition, ensuring your documents maintain clarity over time. This specialized paper prevents yellowing and fading, making it perfect for long-term document storage and critical business records
- Superior Writing Performance: Expertly crafted for smooth writing across all pen types, this premium paper minimizes feathering and provides consistent ink flow. The optimized surface ensures crisp, professional results whether using fountain pens, gel pens, or markers
- Environmentally Certified: Kokuyo loose leaf paper carries Forest Stewardship Council (FSC) certification, guaranteeing that materials come from third-party verified, sustainably managed forests, demonstrating our commitment to environmental responsibility

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BX9SPDMZ |
| Best Sellers Rank | #13,951 in Office Products ( See Top 100 in Office Products ) #57 in Copy & Multipurpose Paper |
| Brand | KOKUYO |
| Color | White |
| Customer Reviews | 4.4 4.4 out of 5 stars (23,128) |
| Date First Available | March 2, 2023 |
| Item Weight | 2.26 ounces |
| Item model number | KB-34N |
| Manufacturer | KOKUYO |
| Manufacturer Part Number | KB |
| Number of Items | 5 |
| Paper Finish | Smooth |
| Paper Weight | 58 |
| Product Dimensions | 11.69 x 8.27 x 0.1 inches |
| Sheet Size | B4 10.1x14.3 Inches |
| Size | B4 (9.8 x 13.9 in) |

## Product Details

- **Brand:** KOKUYO
- **Color:** White
- **Item Weight:** 64 Grams
- **Paper Finish:** Smooth
- **Sheet Size:** B4 10.1x14.3 Inches

## Images

![Kokuyo B4 (9.8 × 13.9 inches) KB Paper, 5 Ream (2500 Sheets), 64gsm, 80 Bright - Perfect for Legal documents, Technical Manuals and Research Papers- FSC Certified, Japan Import (KB-L31TN) - Image 1](https://m.media-amazon.com/images/I/81JpW2HNcNL.jpg)

## Available Options

This product comes in different **Pattern, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Watercolor works great on this paper
*by M***S on October 22, 2025*

I LOVE this paper! I started using this paper to make my own A5 planner since my perfect-for-me planner didn’t exist. Paper prints easily off my cheap printer for my planner sheets and doesn’t clog the machine. I love how highlighters look vibrant and true to color on this paper too. The paper is slightly thicker than 52 gsm tomoe river paper but thinner than regular printer paper. If you love watercolor as much as I do, this paper works well, blends colors easily, layering is great, and can handle wetter paint (whereas the 52 gsm tomoe river paper dries too quickly and can’t do super wet water washes). There is no bleed thru of the watercolor paints. You will still see and feel some crinkling but not as bad as the tomoe river paper. I’ll add some blank pages in the back of my planner just for watercolor sketches. I think this paper is worth it!

### ⭐⭐⭐⭐⭐ GREAT paper for fountain pens.
*by T***N on September 5, 2024*

I use this paper to make custom inserts and note pads for my Midori Traveler's Notebook. I make calendars, lined paper, dot grid, and graph. It has a coating on it that prevents bleed-through and ghosting of fountain pens. It has a great feel as well. It feeds through my laser printer with no problem, although there is an occasional creased page when printing both sides, I would say this is less than 5% of the time. At 64 gsm this paper is thinner than "typical" copy paper, which means in space-conscious applications like portable notebooks it works well where you can get more pages into the same thickness. The thinness doesn't feel like "cheapness" at all. I would call the color of this paper "cream". It is a pleasing color, but definitely not white. Overall, I couldn't be happier with this paper.

### ⭐⭐⭐⭐⭐ Excellent Paper, Disappointing Arrival Physical Condition
*by S***S on August 8, 2025*

The paper itself is excellent, with an Epson inkjet the look of the ink is second to none as far as standard office paper goes. Also when using a fountain pen no feathering and minimum bleed through was encountered. However the one issue I encountered that was disappointing is the reams were dinged up during delivery. It happens, but when you spending this much for only 5 reams of paper, that is uncalled for. I can gladly report though that the paper has fed jam free through my MFP even despite of all the dinged up corners.

## Frequently Bought Together

- Kokuyo B4 (9.8 × 13.9 inches) KB Paper, 5 Ream (2500 Sheets), 64gsm, 80 Bright - Perfect for Legal documents, Technical Manuals and Research Papers- FSC Certified, Japan Import (KB-L31TN)
- Kokuyo Campus Slide Binder with 5 Tab Dividers, Middle Type, B5, 26 Holes, Up to 100 Sheets, Blue, Japan Import (RU-P333NB)
- Kokuyo Campus Loose Leaf Paper for Binders, Sarasara Smooth Writing, B5, B 6mm Dotted Ruled, 26 Holes, 36 Lines, 100 Sheets, pH Neutral, Bleed Resistant, 75gsm, Japan Import (NO-836BTN)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-04*