Gravity45-Aluminium Edition Self-Review｜40% keyboard with the full enjoyment of metallic mass.

I am doing a self-review in order to somehow spread this charm to the world.

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Gravity45-Aluminum Edition is a 40% layout mechanical keyboard available for pre-order at Greenkeys Shop. The Gravity45-Aluminum Edition is a mechanical keyboard with 40% layout.

The board design and design was done by takashiconpany, and the aluminum case design was done by Skeleton Keyboard.

The planning and sale of products is a project undertaken by Greenkeys.

This is the first “mechanical keyboard with aluminum case” for Greenkeys, and a MOQ (minimum order quantity) has been set to lower the product cost.

As of September 15, the number of applications was “9,” and the cloud is getting a bit cloudier.

The application deadline is set for September 24, but we’ll see what happens.

So, I am going to do a self-review to see if I can convey the appeal of this keyboard as much as possible.

Please take a look at it!

Gravity45-Aluminum Edition Overview

• Sales price: 30,000 yen (tax included)
• Sales period: until September 24, 23:59
• Sales Format: Pre-order sales
• Minimum order quantity: 20 pieces
• Scheduled delivery: sequentially from January 2026
• Seller: GreenEchoes Studio
• Store: Greenkeys Shop

contents

• PCBA (glossy black substrate)
• Aluminum top case
• Aluminum Bottom Case
• Switch plate (matte black)
• 4 M2 x 8mm screws
• MountPin set (4 pins + special PE spacer)
• Silicon pad set (4 exclusive rubber feet)
• High Pro Keycap Set for Gravity45 (Keyreative KAM ASTHA Garvity Custom)

Technical Specifications

• Layout: 40%.
• Number of keys: 45keys
• Switch type: Cherry MX compatible
• Stabilizer: None
• Mounting type: Floating mount with MountPin
• Hot-swap: Supported
• Backlight: South-facing RGB-LED (center key only)
• Backlight mode: Same as Remap setting
• Supported systems: Windows / macOS
• Connection method: USB Type-C
• Microcontroller used: RP2040-Zero
• Material: Top case/bottom case – aluminum
• Finish: Anodized Matte Silver+Bead Blast
• Plate material: FR4 (Matte Black)
• Keycap: Keyreative KAM ASTHA Gravity Custom (DyeSub PBT)
• Battery: None
• Size: 333mm*108mm*28mm
• Typing angle: approx. 4.2 degrees
• Weight: Approx. 1200g

[Photos] Gravity45-Aluminum Edition Review

Let’s take a look at the Gravity45 Aluminum Edition.

We will start with the top view.

The case design has large margins and the massiveness of the aluminum is very attractive.

The layout is a 40% one-handed six-row layout with a row-staggered layout (the same horizontal offset as a regular keyboard), which makes it easy to switch from a regular keyboard to a new one.

The separate left and right hand configuration can be seen as both an advantage and a disadvantage in terms of correcting the touch typing roles of the right and left hands.

A separate central area is provided for the Artisan keycap.

Artisan keycaps are keycaps intended for decorative purposes

Currently, Ekam Vahini by Renno Murasaki is installed.

Compared to a regular keyboard, there are no number lines or symbols.

Enter that point while holding down the Layer button.

The fact that the decorative keys, such as BS and Enter, are abstract symbols rather than generic symbols is another area of disagreement.

Then let’s look at the sides.

The top case of this unit, which has a two-piece upper and lower structure, is made large, and the corners are finished with very smooth radii.

The side molding also has a simple look with minimal waste.

There are no switches around it, only a USB Type-C insertion hole on the back.

The USB port is slightly recessed.

The typing angle is set at approximately 4.2 degrees.

The included keycaps are designed not to be sloped by rows, and care has been taken to allow the keycaps to be attached in any position.

Let’s look at the bottom.

The bottom has a simple appearance with no logos, etc., and specially designed rubber feet “silicone feet” are attached in four places.

The skeleton keyboard designers in charge of case design were so particular about the case that they were thorough in creating a special depression for rubber feet.

This is a case where these details shine.

Let’s disassemble the case.

The top and bottom cases are held together from the bottom by four screws.

It has a floating mount structure with “mounting pins” made of silicone material, and there are eight depressions to receive them.

The modeling of the USB insertion slot is also very carefully designed, as are the escape indentations in the microcontroller section.

Let’s also look at the top case.

The top case has eight holes to receive mounting pins.

The borders of the inner and outer diameters are also very finely designed to ensure a perfect fit with the bottom case.

When the board is actually set in the bottom case, it looks like this.

Keystroke feel and sound of Gravity45

The key feel is “slightly hard”.

This is because the standard mounting pins are made of a harder material than Tadpole (50A).

Changing to tadpole (50A) will result in a softer hitting feel.

Then listen to the sound of the percussion.

The keyswitch used is Chosfox x Masro Ranga Linear.

Thus, the percussion sound is closer to Clacky.

Since it has a rugged structure with no foam, the impression is that the case would be better suited to a choice of Clacky tendency as a keyswitch.

About Gravity45 key layout

The basic key layout of the Gravity45 is a 40% layout with MOD keys on the left and right ends.

This was devised in response to feedback that the hurdle to use the system was too high when Gravity36 was sold.

On the other hand, it is designed to be used as a “30%” layout, the same as Gravity36.

Thus, Gravity45 can be used at 40% or 30% depending on the keymap.

For more information on keymap customization, please click here.

Size of Gravity45

The size on the catalog specs is as follows.

Size: 333mm*108mm*28mm

However, since this is difficult to visualize, let’s look at a comparison photo with an actual keyboard.

First, we will compare it with the HHKB English layout.

As you can see, the height is roughly the same, but Gravity45 is larger with respect to width.

Then compare it to a 65% sized keyboard.

Thus, both length and width are almost the same size.

Think of it as 65% the size when placed on a desk.

By the way, if you want to carry it, the Arcis S-size case is perfect.

Gravity45 keycap customization

The default keycap is good, but the other keycaps are quite nice as well.

We dared to use a simple silver-colored case in order to match any keycap.

Disadvantages to consider before buying Gravity45

Since this area is unavoidable, I will write about the honest disadvantages.

High price

Gravity45 is priced at 30,000 yen (tax included).

Given that a regular keyboard can be purchased for as low as 3,000 yen, it’s normal to feel “That’s expensive!!!!” It is a normal feeling.

However, the neighborhood that does such crazy things is the homebrew keyboard neighborhood.

The cost of aluminum keyboards on the street has come down considerably thanks to mass production.

A cheap one may be available for about 20,000 yen.

After all, if this is done by a small-scale business, the price will inevitably be about this much.

To reach the sales line of 30,000 yen, we need a certain number of orders, and that line is “20 units.

It’s just too expensive! To encourage those of you who are not so sure, we have secretly issued a coupon code.
Enter “GREENTHX202509” at checkout to receive 10% off Gravity series only.

Possibly large switching costs from regular keyboard

This is a most favorable comment.

If a normal keyboard refers to a keyboard with more than 75% function keys, then this keyboard without even a number line is an anomaly.

But strangely enough, by “getting used” to it, I have actually been able to type faster than with a regular keyboard.

One of the charms of a small keyboard is that you can enjoy the almighty feeling of “Isn’t it amazing that I can do a decent job even with such a small number of keys?

If you think it might be even a little “interesting,” I hope you will give it a try.

Requires a lot of guts to carry.

Gravity45 is made of aluminum and weighs 1.2 kg.

Blunt instrument.

It takes guts to carry it around, but if you use it in a cafe or at work, you are sure to be the center of attention.

Assembly required

Gravity45 is a DIY keyboard and requires assembly.

However, soldering is not required, and the unit can be assembled with a single screwdriver.

Prepare a key switch of your choice.

Concerned about support

Perhaps this is the most worrisome part for first-time users of homemade keyboards.

For those who are interested, we have prepared answers to possible questions.

Questions that cannot be resolved here will be answered individually.

Please contact us here.

I don’t know where or who sells it.

Gravity45 is designed and marketed by GreenEchoes Studio in Niigata, Japan.

Founded in 2019, the business operates keyboard media, sells keyboard parts, and does web writing.

We hope you will be assured that we are vigorously working to submit press releases from PRTIMES and are operating a real business.

summary

This has been our self-review of Gravity45.

I think it is a very sharp product, but that is why it is a keyboard with great appeal.

Perhaps, if you miss this opportunity, you will never be able to manufacture it again.

If you are at all curious, why not consider purchasing one?