Product 01
pen style
Classic, fine control | pen style
Concept
Every line unfolds
a new color.
Echoes of the seasons, brought to life by craftsmanship: OZREE Siki. The dense, resilient cherry grip anchors the blade, transmitting fine vibrations to your fingertips as it cuts into the glass. Organic and gentle, it welcomes the hand, maturing with every touch into a tool uniquely your own. The joy of weaving lines at will as the glass sings beneath the blade unfolds boundless possibilities for free expression.
Design
True to its name,
uncompromising in form
The word “Siki” is not only Japanese for the four seasons, it also identifies the tool as a vessel (ki) that honors artisanal craft and creators’ resolute will (si). The tool’s exquisite form balances the warmth of natural wood and the precision of cold metal. Two grip silhouettes are available: “pen style,” the basic shape designed for tracing delicate lines, and “palm hold,” offering the stability and comfort of a full-handed hold. The result transcends the realm of mere tools to become an intimate creative partner.
Product 02
palm hold
Stability in the palm of your hand | palm hold
Feature
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A cherry grip
that grows with you
The natural resilience and warmth of cherry wood firmly anchor the blade. Hand-carved by skilled artisans, this grip’s finely textured grain gently cushions the cutting edge while transmitting the delicate vibrations to your fingertips as it bites into the glass. The wood adapts to your touch over time, deepening with every creative endeavor into a tool uniquely your own.
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Clear visibility,
precise lines
The ultra-slim cutter head pared down to the absolute limit offers an unobstructed view of where the wheel meets the glass. Never lose sight of delicate artistic nuances as you trace sweeping straights and intricate curves at will. Follow your intended path with unyielding, rock-solid precision.
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Trusted sharpness
to carry intent to the core
Meticulously honed from Japanese-made cemented carbide by skilled artisans, the blade delivers a vivid, effortless cut that reaches deep into the core of the glass. It glides with virtually no resistance, making the glass sing beneath it—no need to press harder. The reassuring feedback of scoring a clean, uniform line at the ideal depth keeps your creative rhythm seamlessly in the zone.
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Crafted by our hands,
delivered to yours:
design without compromise
“Only the best may leave our hands”: this ethos lies at the heart of Mitsuboshi Diamond Industrial’s manufacturing spirit. Throughout our 90-year journey through mastery of glass-cutting tools, we have taken pride in both precision metalwork and traditional woodworking, designing instruments without compromise and sending only the finest into the world. Imbued with the natural warmth and resilience of wood, Siki shapes itself to your sensibilities and stays with you for every step of your creative journey.
Interview
Conversing with wood,
finding curves that
fit the palm
Woodcraft artisan, TUNNEL WORKS Hiroaki Nakada
Crafting custom furniture and everyday objects by hand is my trade. For this project, I was asked to create a versatile grip—one that could be pushed, pulled, or held just like a pen. Rather than machining it strictly to a blueprint, I held the grip in my own hand, gradually shaving away any edges that pushed against the palm. Through repeated rounds of prototyping, I arrived at these smooth, organic curves that almost seem to naturally adhere to the hand.
For the material, I chose Japanese cherry wood for its density and resilience. It fills the air with faint, sweet aroma as you carve, and its fine, tight grain yields an exceptionally smooth touch without any catches. This is a tool that naturally deepens its bond with its user’s hand over time, and I hope it brings an effortless, joyful rhythm to their daily work of creation.
Rooted in a 90-Year legacy,
evolving alongside users
Iida Plant, Mitsuboshi Diamond Industrial Muneyasu Goto
The Siki project began with a simple question: “Could we combine the local timber of Iida, Nagano, with our precision metalworking to create something entirely new?” As it happens, our very first glass cutter, released upon our founding in 1935, had a wooden handle. This project challenged us to return to those roots on our 90th anniversary and revive that handcrafted warmth.
OZREE glass cutters resolve a longstanding frustration of artists: the inability to clearly see the point of contact between the blade and the glass. With Siki, to ease the strain on artisans who score hundreds or even thousands of sheets a day, or any creators with less grip strength, we developed a “palm hold” design that fits naturally in the hand. Siki combines Nakada-san’s handcrafted grip with our precision engineering, and we hope Siki it will become a trusted partner that effortlessly supports your creative journey.
Review
Gliding like a brush:
the future of glass art
Artist Mari Hirano
To cut glass, I must first score the surface firmly. As I lean into the cutter with real pressure, I listen closely for that faint, crackling sizzle as it glides—the sound that lets me confirm the blade has truly engaged the glass. Lacking substantial hand strength, I used to put my full body weight on the grip for each cut, which made traditional, heavy tools exhausting to handle. On top of that, conventional blades are so thick that they obscure the traced lines beneath and force me to rely strictly on intuition—a constant source of stress.
That’s why holding the OZREE Siki for the first time was such a revelation. The ultra-slim blade leaves the point of contact with the glass completely visible, letting me trace my intended line without wavering. Even when I apply my full weight, the blade never wobbles—a true testament to the artisanal engineering behind it. The natural wood grip fits effortlessly in my palm, and the blade moves as freely and lightly as a calligraphy brush across paper. When I use the OZREE Siki, I am completely immersed in the pure joy of creating.
Transitioning from the fast-paced apparel industry to the art world in search of my own voice, I developed my signature technique Negoro-tsugi. It fuses Western stained glass with the traditional Japanese art of kintsugi, interwoven with the heritage of Muromachi-period Negoro-nuri lacquerware from my hometown in Wakayama. Tsugi means both inheriting and mending, and connecting materials, histories, and human devotion in this way opens new forms of expression. That is why this cutter, which inherits and carries forward the spirit of fine handcraft and 90 years of manufacturing pride, resonates with me so profoundly.
Behind every new culture that takes root and flourishes, there is always a tool worth cherishing. Glass art and craft remain an unfamiliar realm to many; having a cutter that is both beautiful and intuitive lowers that threshold dramatically, and will inspire more people to try working with glass themselves. I am certain that this single instrument, alive with the mastery of artisan craft, will spark a new wave of creative expression in Japanese glass art.
Artist Mari Hirano
To cut glass, I must first score the surface firmly. As I lean into the cutter with real pressure, I listen closely for that faint, crackling sizzle as it glides—the sound that lets me confirm the blade has truly engaged the glass. Lacking substantial hand strength, I used to put my full body weight on the grip for each cut, which made traditional, heavy tools exhausting to handle. On top of that, conventional blades are so thick that they obscure the traced lines beneath and force me to rely strictly on intuition—a constant source of stress.
That’s why holding the OZREE Siki for the first time was such a revelation. The ultra-slim blade leaves the point of contact with the glass completely visible, letting me trace my intended line without wavering. Even when I apply my full weight, the blade never wobbles—a true testament to the artisanal engineering behind it. The natural wood grip fits effortlessly in my palm, and the blade moves as freely and lightly as a calligraphy brush across paper. When I use the OZREE Siki, I am completely immersed in the pure joy of creating.
Transitioning from the fast-paced apparel industry to the art world in search of my own voice, I developed my signature technique Negoro-tsugi. It fuses Western stained glass with the traditional Japanese art of kintsugi, interwoven with the heritage of Muromachi-period Negoro-nuri lacquerware from my hometown in Wakayama. Tsugi means both inheriting and mending, and connecting materials, histories, and human devotion in this way opens new forms of expression. That is why this cutter, which inherits and carries forward the spirit of fine handcraft and 90 years of manufacturing pride, resonates with me so profoundly.
Behind every new culture that takes root and flourishes, there is always a tool worth cherishing. Glass art and craft remain an unfamiliar realm to many; having a cutter that is both beautiful and intuitive lowers that threshold dramatically, and will inspire more people to try working with glass themselves. I am certain that this single instrument, alive with the mastery of artisan craft, will spark a new wave of creative expression in Japanese glass art.
Movie
Glass Cutter
Carve Light. Unfold Color. A glass cutter that frees your creativity.
LIMITED EDITION
gloss black / matte black