AERO FX

LOOK.

The pop of color on the pivot is the visible signature of a knife that has eliminated all that is superfluous. The exact point where the tension of the entire project converges. You feel it even before realizing why you are looking at it.

THINK.

For thirty years, Extrema Ratio has built knives for those operating where tools simply cannot afford to fail. Then one day, a question arose: what would a knife look like for an enthusiast of EDC and beauty, without compromises? The answer takes the form of a profile that the wind flows through without resistance. And a 4.8 mm blade thickness that tells another story—one of a tool that never forgets where it comes from.

IMAGINE.

Antoine de Saint-Exupéry used to say that perfection is achieved not when there is nothing more to add, but when there is nothing left to take away. AERO FX is the answer to that question, with an 80 mm blade and a 191 mm total length that leave no room for doubt.

FEEL IT.

The sharp, clean lines of the skeletonized full-tang handle merge beneath your fingertips into a solid, fluid, and continuous geometry, free of any unnecessary thickness. At the center of this monochromatic balance, the pop of color on the pivot concentrates the visual tension of the design, acting as a magnetic yet discreet signature. It is a tool conceived to blend seamlessly with the personal aesthetic of those who appreciate the true substance of matter.

Built to last. Easy to maintain.


Anticorodal aluminum handle. Nitrogen steel blade with MIL-C-13924 burnished finish: superior corrosion resistance, edge retention that exceeds daily use expectations, and easy resharpening that requires no specialized equipment. Maintenance is kept to an absolute minimum. Because a tool that demands too much ends up left in a drawer.

One thing that changes everything.


The scale overlays of the AERO FX are designed to be replaced. With a few simple steps, well within anyone’s reach, you can change color whenever you want. Today Black/Lime. Tomorrow Blue/Orange. The day after, a variant you invented yourself.

Carry system.


The AERO FX sheath is a project on its own. Two pre-shaped Kydex pieces: the first features an ultra-flat, slim profile, designed to blend in and disappear under any clothing. The second, an additional Kydex interface, expands the mounting footprint to ensure stability with accessories like a belt clip. Two geometries. One solution.

It can be secured using the two included Malice clips or freely configured by threading paracord through the perimeter eyelets. Both are included. Because versatility should never be an option.

A flexible solution that allows the beauty of the tool to remain a purely personal secret.

Available as optional extras: Belt clip, Ulticlip, Malice clips for MOLLE System.

What’s in the box.

AERO FX knife. Ultra-slim Kydex sheath. Additional Kydex carry interface. Paracord. Double cut-resistant rubber loops for horizontal belt carry.

Choose yours.

AERO FX NITROGEN BLACK LIME: The lime detail is a jolt that captures the eye before the mind processes why.
AERO FX NITROGEN BLACK ORANGE: Contained warmth on matte black.
AERO FX NITROGEN BLACK BLUE: The deep magnetism of electric blue emerging from the shadows.
AERO FX NITROGEN MUD ORANGE: Tones that reveal themselves only under the right light.
AERO FX NITROGEN FOREST GREEN ORANGE: A green that doesn’t shout. An orange that answers.
AERO FX NITROGEN BLUE ORANGE:
The boldest contrast in the collection. The result is pure visual tension.

Extrema Ratio. Since 1997.
Every knife leaves our workshop in Prato with a lifetime warranty. A commitment we honor every single time, without exception, anywhere in the world it was purchased.

MAKE IT YOURS.