

Ballpoint Pen Refill - Gel Ink - Black
Black 0.7 mm gel ink refill from ystudio, made by the Japanese brand OHTO, featuring a metal body and smooth tip. Length 98 mm, diameter 5.8 mm, compatible with classic-revolve and YAKIHAKU ystudio pens as well as most Parker refill pens.
YSTUDIO 0.7mm Gel Ink Refill (Black) for Portable Ballpoint Pen / Ballpoint
The YSTUDIO 0.7mm gel ink refill is custom-made by the renowned Japanese manufacturer OHTO. The 0.7mm black ink tip with a metal body allows for stable and smooth writing.
Compatible with the portable ballpoint pen "classic-revolve" and the portable ballpoint pen "YAKIHAKU" from ystudio
Fits most pens using Parker Type refills.
- Length: approx. 98 millimeters
- Diameter: 5.8 mm
- Tip size: medium (0.7 mm)
THE WEIGHT OF WORDS
How long has it been since you picked up a pen and wrote from your heart?
When writing to your loved ones or friends, you will find touching feelings, love, and tranquility between the lines. With our love for words and materials, we would like to introduce you to YSTUDIO stationery. Through YSTUDIO, we want to tell you a story about writing.
Let’s set aside electronics for a moment. Feel the warmth and weight of words in writing. Write with your sincerest feelings and rediscover the fading culture of handwriting.
LEARN MORE ABOUT YSTUDIO
What YSTUDIO creates is not just the object itself, but also the true meaning behind it. They believe that every object embodies a deeper significance. Through their products, they hope to bring more imagination into people’s lives, which is why they design products for everyday use.
YSTUDIO values simplicity in design very highly.
Features
- Dimensions
- 98 millimeters × Ø 5.8 mm
- Weight
- 20 g
- Material
- Brass
- Color
- Black
- Origin
- Taipei, Taiwan
- Brand since
- 2012

Born in Taipei, engraved in brass
Since 2012, ystudio has been crafting writing instruments in brass and copper in Taipei. The metal is deliberately heavy to give weight to the gesture. Over time, the surface develops a patina through letters, notebooks, and signatures.





YSTUDIO EXPERTISE
What makes these instruments unique
The weight, embraced
Brass gives pens a solid weight that grounds the hand. Writing becomes a deliberate, almost ceremonial gesture.
Living metals
Brass and copper darken when touched by fingers. Each pen takes on the patina of its owner.
The lacquer and the detail
Lacquered bodies, fine engravings, precise mechanisms: craftsmanship cares for what the hand touches.
Designed to last
Standard refills and replaceable parts: instruments made to write for years.
A studio, an idea
ystudio advocates for slow writing: slowing down, choosing your words, giving them weight.
Taipei, the workshop
The brand was born in the Taiwanese design scene, blending the tradition of writing with contemporary minimalism.




