"keu" is a leather brand that expresses the beauty of randomness and decay through "rust aging leather," which is genuine leather that has been given a unique rust treatment.

"keu" is made by waji, a craftsmanship group that produces leather wallets and small leather items. The material they use, "rust-aged leather," is made by spraying metal powders such as brass, red copper, and iron onto the surface of the leather to induce rust. No two pieces of genuine leather have the same rust appearance, giving them a subtle yet striking individuality.

"keu" leather accessories feature seamless patterns with minimal seams to maximize the unique character of the rust-aged leather. They also feature a complex skiving process (partially adjusting the thickness of the leather) to create a simple silhouette. The brand logo is purposefully omitted, resulting in a minimalist design that maximizes the appeal of the rust-aged leather.

Aiming to be "crafts that can be used daily," Keu's leather items are made using the experience and sensibilities of leather craftsmen, and exude a unique and rare presence, exuding a Japanese sense of wabi-sabi beauty.

This is a special leather that is carefully finished by leather craftsmen who spray metal powder on each piece.


Copper rust


Brass rust

A metal plate is hand-sewn onto the flap, adding an accent that represents the world view of keu.


Pig leather is attached to the inside, giving it both strength and a high-quality texture.

[Rust-aged leather]

Using the experience and sensibility of leather craftsmen, each piece of leather is sprayed with metal powder and carefully finished, creating a special leather that exudes a presence reminiscent of a work of art.

The unique texture is created by spraying brass, red copper, and iron onto the surface of the leather to evoke the appearance of rust. Each piece of rust-aged leather has a slightly different look, and no two pieces are alike.

The finish is coated, so there is no need to worry about metal particles falling off or excessive rust. The surface has a unique roughness, but it is not sharp, so you can use it with confidence.

A compact and highly portable mini 6 size system notebook.

"M6 size" is perfect for business situations

Six-hole ring

It is held in place by a magnet.


The thickness is about 1.5 cm

The perfect size for writing quickly while standing on the go.

Its compact size of H15.2 x W9.7cm makes it easy to take out during meetings and business negotiations. It's just the right size, not too small and not too big.

A notebook like a work of art for your everyday life. A quiet presence in the workplace.

Also recommended as a present or gift.

Keu's M6 system organizer cover is for men seeking a sense of solidity and individuality. The leather surface is sprayed with metal powders such as brass and red copper, and a special process is used to cultivate rust, giving it a unique presence that cannot be found in ordinary leather products.

The more you use it, the more it changes its appearance, making it a truly sophisticated tool. Whether for business or personal use, just carrying it will quietly assert your "attention to detail."

In addition, its special texture and unique design make it the perfect gift to convey your feelings to someone special.
It will surely be a memorable gift that will be appreciated not only on anniversaries such as birthdays, Christmas, Valentine's Day, and White Day, but also on other important occasions in life, such as Mother's Day, Father's Day, Respect for the Aged Day, and retirement.

*Rust-aged leather is created by the reaction between metal powder and leather, so there will be individual differences in color and pattern. Please enjoy the unique flavor of the material.

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Even when dyed with the same dye, natural leather will have individual differences in color. Also, there may be wrinkles and small natural scratches on the surface of the leather, but please understand that these are characteristics of natural leather and each piece's individuality.

This product contains metal powder, so please be careful when handling if you have metal allergies.

*As this is a special leather that is finished by evoking rust, the color and pattern will vary from piece to piece. Please understand that no two pieces are the same and each one is unique.

We strive to secure stock, but if an item is out of stock, it may take one to one and a half months to produce and receive it. If you have any questions about stock availability or arrival dates, please feel free to contact us.

Please note that if you put the bag in the pocket of light-colored pants, the color may transfer to other items. Also, leather is susceptible to rain and sweat, so if it gets wet, please allow it to dry naturally. Using the bag while it is wet may cause discoloration or color transfer. We recommend storing the bag in a well-ventilated area.