Everyday Refills, Elevated: Deff Showcases the REFILL PEN JACKET Series at Japan's ISOT

Tokyo, June 23, 2026

DeFF Corporation (President: Toru Araki; Headquarters: Minato-ku, Tokyo) will exhibit at the 37th International Stationery & Paper Products Show [Summer] (ISOT), held within the 29th Lifestyle Week [Summer] at Tokyo Big Sight from Wednesday, June 24 through Friday, June 26, 2026.

At booth L99-33, DeFF will center its display on the REFILL PEN JACKET series, the brand's line of writing instruments built around off-the-shelf pen refills. Visitors will be able to pick up and compare models crafted from aluminum, titanium, natural wood, and carbon, each offering a distinct texture, weight, and writing balance.

The company will also present, for reference only, a new REFILL PEN JACKET model currently in development, along with an entirely new stationery product line — an early look at where DeFF's stationery business is headed before either item goes on sale.

An Everyday Refill, Elevated to a Fine Writing Instrument

REFILL PEN JACKET pairs commonly available pen refills with an exterior chosen for material and design, turning an everyday writing habit into something more considered. The familiar feel of a refill you already know stays the same — what changes is the weight in your hand, the texture of the material, and the quiet satisfaction of owning something well made. The lineup spans the precision of aluminum and titanium, the natural variation of solid wood, and the light, distinctive character of carbon.

The Full Series, Side by Side

At the show, the REFILL PEN JACKET series will be grouped by material and by series so visitors can compare models directly — a texture, balance, and material feel that photos and spec sheets don't fully capture. Beyond retail, the DeFF team will be on hand to discuss gifting programs, corporate novelties, commemorative items, and OEM or custom-order projects.

A First Look at What Comes Next

DeFF will also display, for reference, a new REFILL PEN JACKET model still in development — built on the material processing and design philosophy of the existing series while aiming to serve a wider range of everyday uses. Alongside it, the company will preview an upcoming stationery product that extends beyond pens, applying the design and material expertise DeFF has built through its smartphone accessories and lifestyle products to a new category. Specifications, pricing, and launch timing for both reference items remain subject to change.

Featured Products

• REFILL PEN JACKET Stream Design Collection — aluminum and titanium models with a precise, minimal profile suited to business settings, alongside the original solid-wood version prized for its warmth and one-of-a-kind grain.
• REFILL PEN JACKET Magnalock Design Collection — compatible with more than 700 refill types, finished in brass and aluminum, with a magnetic cap that made this model a fan favorite.
• REFILL PEN JACKET Extra Short Design Collection — a compact series balancing portability with the same material quality in a smaller form.
• New REFILL PEN JACKET (reference exhibit) — an early look at DeFF's next model.
• New stationery product (reference exhibit) — the first product beyond REFILL PEN JACKET in DeFF's expanding stationery lineup.

Exhibition Details

About DeFF

The name "DeFF" stands for "Design Evolution For the Future." It reflects the company's aim to propose the lifestyle best suited to today through original ideas and evolving design, and to help build a more convenient, more comfortable future. As user needs and expectations of "ease of use" keep changing, DeFF keeps both product planning and design in-house — choosing the right materials and refining each product's form and function to match.

Source: DeFF News & Journal, "いつものリフィルを、上質な一本へ。ディーフが文具展示会でREFILL PEN JACKETシリーズを展示" — https://www.deff.co.jp/news/260623/ (published 2026-06-23). English adaptation for Shopify News.