Born from a devotion to brass,
CuLover is a letter opener made to last a lifetime.
CuLover was born from M’s Maker —
a product brand launched by a small metal workshop in Japan.
Named after “Cu,” the chemical symbol for copper,
and the clover, a symbol of good fortune,
it is a piece designed to quietly express gratitude and well-wishes.
CuLover received the Best Concept Award at the 18th LIFE×DESIGN, part of the 100th Tokyo International Gift Show Autumn 2025.
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Deepening Brilliance Over Time
Brass is known for its warm golden sheen —
and for the way it evolves.As time passes, its surface develops a deeper tone and character,
growing richer with use.
A material meant to be lived with, not replaced.Naturally resistant to rust,
with antibacterial properties and lasting durability,
brass aligns with a more sustainable way of living.
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A Form That Fits the Hand
Designed to highlight the inherent beauty of brass,
its smooth, flowing curves rest naturally in the hand.Weighing nearly three times as much as aluminum,
it delivers both durability and a sense of substance.
It also serves effortlessly as a paperweight.Elegance, grounded in function.
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Crafted with Precision and Pride
Produced in a small Japanese metal workshop,
CuLover is shaped by skilled artisans
whose experience is measured in decades.Its blade is engineered for a refined edge —
sharp enough to glide,
yet controlled enough not to cut too deeply.As brass matures over time,
we hope the bonds between giver and receiver do the same.
Spec
| Material | Solid Brass (60% Copper, 40% Zinc) |
|---|---|
| Dimensions | Ø60×24.5mm |
| Weight | Approx.515g |
| Included | Main body, Instruction card (QR code manual), Replacement blade |
| Blade | Replaceable, Compatible with OLFA Art Knife Blades (XB10) |
| Hand Orientation | Adjustable (Right-handed setup by default) |
How it works
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PositionPlace the opener on a flat surface
with the groove facing your dominant hand.Right-handed users: groove on the right.
Left-handed users: groove on the left.
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Insert the EnvelopeGently slide the envelope into the groove.
The blade will contact only one side.
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GlideSlowly slide the envelope forward.
No force is needed.
Let the blade do the work.
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Open CleanlyOnly one side of the envelope is cut,
allowing you to open it
without damaging the contents.
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Functions as a paperweightWith the natural weight of solid brass,
CuLover also functions as a paperweight
when not in useExperience elegance grounded in utility.
- This product contains a blade. Please handle with care.
- Store in a dry place away from heat and humidity.
- Moisture in envelopes, creases, or dust around the blade area may affect cutting performance. Check before use.
Care
CuLover develops character over time,
its surface evolving with every use.
- After use, gently wipe with a soft cloth.
- Discoloration is a natural property of brass and not a defect.
If you prefer to restore its original shine, use a polish formulated for metal.
Replaceable Blade & Hand Orientation
CuLover is designed for long-term use.
The blade is replaceable, and the cutting orientation can be adjusted for right- or left-handed users.
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Blade Replacement
If the blade becomes dull,
remove the screw on the back using a Phillips screwdriver and replace the blade. -
Compatible Blades
Compatible with commercially available art knife replacement blades.
Example: OLFA Art Knife Blades (XB10). -
Switching Hand Orientation
By repositioning the blade,
the opener can be configured for either right- or left-handed use.
Delivered pre-set for right-handed users.
※Left: for left-hand use / Right: for right-hand use
- Caution: This product contains a blade. Please handle with care.
Engraving Service
Personalize CuLover with a name, date, or message —
and create a piece that is truly one of a kind.
We provide individual quotes and guidance based on your request.
Please note that engraving placement, character count, and font options are subject to certain limitations.
If you are interested, we invite you to contact us using the inquiry form below.
Crafted by Matsunaga Iron Works
CuLover is manufactured by Matsunaga Iron Works,
based in Nobeoka, Miyazaki, Japan.
Founded in 1979 with a single conventional lathe,
the company has since produced precision components
for aircraft, satellites, medical equipment, food machinery, energy systems,
automotive applications, and semiconductor industries.
From complex one-off parts to highly specialized geometries
that others decline,
their craftsmen achieve tolerances of 1/100 mm —
and, depending on the form, up to 1/1000 mm.
They machine not only stainless steel and aluminum,
but also titanium, Hastelloy, and other advanced alloys
known for their machining difficulty.
Equipped with turning, machining, milling, wire cutting, and welding processes in-house,
Matsunaga Iron Works maintains a fully integrated production environment.
Their surface finish quality —
often described by clients as “Matsunaga Quality” —
is a defining strength.
From this foundation of precision and pride,
the product brand M’s Maker was born.
And from M’s Maker came CuLover.
Experience the true value of Made in Japan
through a piece designed to last —
and to stay with you over time.
