The brand name “BISO” comes from the Japanese words “ 美 (beauty)” and “ 奏 (harmony),” romanized to express the wish that users can beautifully express themselves through writing, bringing calm and clarity to their minds. This fountain pen is designed to be a comfortable writing companion during your personal moments. Compared to our standard model (#3776 Century), the body is lighter and features a slim diameter that fits comfortably in the hand, resulting in a light and smooth writing experience. The body is made from pearlescent resin, which reveals subtle shifts in color depending on the angle and lighting. A well-balanced pen for everything from everyday use to special occasions.

Product number：PTL-15000

Barrel color #1 Nebula Black #11 Flame Red #28 Mystic Purple #41 Sparkle Mint Green

Size：138mm (full length) x 12.7mm (max. diameter); weight : 18.4g

Specifications

Material：

Cap top, barrel end, cap ring, protective ring, clip（Metal）

Barrel, grip, cap（Resin）

Pen nib : Gold plated on stainless steel（Fine/Medium）

Release date

#28 Mystic Purple and #41 Sparkle Mint Green : September 2025

#1 Nebula Black and #11 Flame Red : November 2025

Elegance in simplicity. Stripping away the unnecessary for a refined design.