Description
DeFF 4th Generation Refill Pen Jacket - Extra Short Design Collection
DeFF 4th Generation Refill Pen Jacket is redesigned with enhanced portability as its top priority, while still supporting your favourite refills. It delivers a comfortable grip, stable writing, and a premium feel — now at a more accessible price. Built around the concept of “Portability × Grip”, it is compact when stored and extends to a practical size when in use. This is the ultra-compact metal pen: Extra Short Design.
iF Design Award 2026, one of the World’s Top 3 Design Awards
The REFILL PEN JACKET - Extra Short has received international acclaim for its innovative design and exceptional functionality, earning a prestigious design award. Experience for yourself the beauty of its refined, minimalist form and the superior tactile feel for its metal construction.
FEATURES
Excellent Portability and Clever Design
The key concept of the 4th generation is PORTABILITY. The cap also serves as the pen body—when stored, the entire pen fits neatly inside the cap, making it compact and space-saving. Even in storage, it can stand on its own, combining practicality with thoughtful design.
- Stored length: approx. 75 mm, easily fits in a pocket
- Writing length: approx. 125 mm, stable and comfortable to hold
- Slightly thicker body for improved grip and writing comfort
Metal Craftsmanship × Artisanal Quality
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Grip: Stainless steel (SUS304) or brass
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Pen body & cap: Aluminum alloy (A6063) or brass
All components are precision-machined from solid metal using CNC, then carefully hand-finished by skilled artisans. The result is a tightly assembled, durable pen with a satisfying weight and feel.
Refills are ready to use—simply insert and start writing
The pen jacket contains just one component. Simply insert your refill into the fixed adapter and place it into the pen body—no shims, springs, or modifications needed.
✔ Compatible with common refills
✔ Supports D1 and 4C sizes
✔ Quick installation and intuitive to use
The key to stable writing: Perfect Weight Balance
Writing stability isn’t about weight—it’s about weight distribution. This design positions the balance point at the center of the pen, with a slightly heavier tip, allowing natural, smooth control. Write exactly where you want—the lines stay steady and precise.
MATERIALS
1. Aluminum
Made from A6063 aluminum alloy, offering the best value for performance.
Well-balanced and highly intuitive to use, available in three anodized colors: Jet Black, Aquamarine, and Ruby Red.
2. Titanium
Made from Ti-6Al-4V titanium alloy, offering high strength and corrosion resistance. Commonly used in medical and aerospace applications, it combines lightweight performance with exceptional durability—our flagship material.
3. Brass
Classic vintage material with natural aging.
This brass model is intentionally left untreated, allowing the surface to develop a unique patina over time. Scratches, color changes, and natural oxidation from handling are all part of its character, making each pen truly yours.
Touching and using the pen may accelerate oxidation—this is normal. Shine can be restored with a metal polishing cloth. Over time, the pen naturally “ages,” gaining a distinctive look and a sense of history.
Refill Storage Case: A dedicated storage case for D1 and 4C refills, capable of holding multiple refills. Quickly swap refills to suit different writing needs, fully enjoying the flexibility and convenience of the Refill Pen Jacket.
Custom Engraving Service『Laser Etching』
Personalized Custom Design: Each pen is one of a kind, perfect for gifting or personal use, combining practicality with lasting sentimental value.
*Please specify your preferred font and the text to be engraved (up to 13 characters, including spaces) in the remarks field.
REFILL SPECIFICATIONS
ECO-FRIENDLY PACKAGING
The box is made from recycled paper and fibers, making it biodegradable or recyclable. Single-color printing is used to minimize ink consumption.
Product Details
1. Brass
· Cap/ Grip: Brass
· Body with Clip: Clip section ABS + PC / Body section Brass
· Dimensions & Weight: Length 125.4 mm (Stored: 75.2 mm), Barrel diameter 15.2 mm, Weight 70 g (Stored)
※ Note: The brass version is left untreated and will naturally develop a patina (aging) with use.
2. Titanium＆Stainless Steel
· Cap: Ti-6Al-4V Titanium Alloy
· Front Sleeve (Grip): Stainless Steel (SUS304)
· Body with Clip: Clip section ABS + PC / Body section Ti-6Al-4V Titanium Alloy
· Dimensions & Weight: Length 125.4 mm (Stored: 75.2 mm), Barrel diameter 15.2 mm, Weight 54.5 g (Stored)
3. Aluminum＆Stainless Steel
· Cap: A6063 Aluminum Alloy
· Front Sleeve (Grip): Stainless Steel (SUS304)
· Body with Clip: Clip section ABS + PC / Body section A6063 Aluminum Alloy
· Dimensions & Weight: Length 125.4 mm (Stored: 75.2 mm), Barrel diameter 15.2 mm, Weight 46.5 g (Stored)
4. Refill Case
· Compatible Refills: D1, 4C (Length: 67–xx mm / Diameter: 2.30–2.35 mm)
· Capacity: Holds up to 5 refills
· Materials: Cap/ Body A6063 Aluminum Alloy
· Dimensions & Weight: Length 72.5 mm, Barrel diameter 15.2 mm, Weight 22 g
Usage Notes
· Refills are not included. Please use compatible refills that meet the specifications.
· Before use, ensure all parts are securely assembled to prevent any movement of the refill.
· Avoid clipping onto thick fabric (e.g., heavy coats), as it may deform the clip.
· Do not store in humid, wet, dusty, high-temperature, or direct sunlight environments, and keep out of reach of children.
Warranty
· Warranty Period: 6 months from the date of purchase or delivery.
· DOA (Dead on Arrival) Coverage: Within 7 days of purchase or delivery.
· Defective items within the DOA period may be repaired, replaced with parts, or exchanged.
· Refills are not covered under warranty.
