GMMK PRO FlexKit Custom 75% Mechanical Keyboard Kit

GMMK PRO FlexKit Custom 75% Mechanical Keyboard Kit

GMMK PRO FlexKit Custom 75% Mechanical Keyboard Kit

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Upgrade your GMMK PRO with a new plate and case foam, three premium gasket options, and a redesigned bottom case. Customize to perfection.

  • Shipping truck icon Free Shipping on Contiguous US Orders $99.99+
  • Shield logo One Year Warranty
  • Black return arrow logo 45 Day Returns
  • Redesigned bottom case for increased PCB/plate flexibility
  • 3 unique gasket materials and 2 custom case foam options for further acoustic tuning
  • G-Foam plate foam absorbs high-frequencies and reflects RGB lighting for brighter illuminationSimple to install
  • Extra gaskets included for stress-free modification
  • Compatible with: GMMK PRO
  • 1× GMMK PRO Bottom Case
  • 5× Case Screws
  • 10× Pre-Installed G-Foam Gaskets
  • 4× Pre-Installed Poron Gaskets

Keyboard Foam

  • 1× G-Foam Bottom Case Foam (1mm Thick)
  • 1× G-Foam Bottom Case Foam (2mm Thick)
  • 1× G-Foam Plate Foam (3.5mm Thick)

3.5mm Thick Gaskets

  • 22× Medium G-Foam Gasket Strips, 20mm Long
  • 22× Medium G-Foam Gasket Strips, 40mm Long
  • 22× Hard EDPM Gasket Strips, 20mm Long
  • 22× Hard EDPM Gasket Strips, 40mm Long
  • 22× Soft Poron Gasket Strips, 20mm Long
  • 22× Soft Poron Gasket Strips, 40mm Long

Find everything to get the most out of your order.

Product Guide

Self-Service Support

Flexible Foundation

The FlexKit’s redesigned bottom case features taller gasket mounts and an expanded interior. These adjustments give the GMMK PRO a bouncier, more flexible typing feel with greater opportunities for acoustic customization.

Craft Your Perfect Typing Experience

We’ve included a range of easily installable foam gasket options with varying densities. Mix and match to find your perfect configuration!

View FlexKit Tutorial

Custom Case & Plate Foams

Bottom case foam options come included in two distinct thicknesses for you to try.



Made from our proprietary G-Foam material, these interior sheets absorb high-frequency typing vibrations for clean acoustics. The reflective surface will also boost the appearance of your GMMK PRO’s RGB lighting.

Three Gasket Types

PORON, G-Foam, and EPDM gaskets let you customize your GMMK PRO’s typing sound and feel to your preference. Installation is quick and easy with extra strips included for stress-free experimentation.

Overall rating: 4.0882354 / 5 from 34 reviews.

AI Generated Review Summary

The GMMK PRO FlexKit Custom 75% Mechanical Keyboard Kit offers a customizable typing experience with a balanced feel and sound profile. The kit enhances the keyboard with a nice bounce, and the foam adds a fantastic feel. Opinions on the sound vary, with some finding it fuller and higher pitch, while others appreciate its deeper sound.

Summary topics

  • Sound Quality: 13%
  • Typing Feel: 22%
  • Customization Kit: 35%
  • Foam Quality: 10%

Review topics: ["improvement","sound","screws","feels","upgrade","build","kit","keyboard","foam","plate","board","cable","flex","typing","case","switches","gmmk pro"].

Review highlights

  • "I opted to not have case foam so overall very happy with softer typing feel of this kit." — Mike K.
  • "Current build uses Glorious Panda switches and overall I get a deep thocky sound most of the time." — Joe W.
  • "The flex kit sounds far better than the original bottom case and gives the board a slightly softer typing feel." — James C.

Reviews

SUPER WORTH IT!!!!

"This Flex kit is super worth the upgrade. It really adds to this keyboard, the foam is fantastic, the new bottom plate is fantastic. The different sets of foam for you to custom install is just fantastic, it really is a fantastic product overall, and I would go as far to say a neccessary purchase to go with the GMMK Pro (at least if you want the most out of your GMMK pro that is. . . )"

— Zach P. (5/5)

Awesome upgrade love the flex.

"Awesome upgrade love the flex. However notice one of gaskets that touches the top plate was installed incorrectly. Was able to move it back to the correct position, but QA should have picked this up. Other than that, awesome product and really recommend pairing with the poly plate, and some gmk keycaps. Love my keyboard thank you."

— David G. (5/5)

"This is what the GMMK Pro needed from the beginning! It drastically changes the feel and improves it in every way possible. I recommend using the included soft pads for the install."

— Jeffrey (5/5)

overpriced, I installed the kit

"overpriced, I installed the kit but did not feel much difference from the stock. what a waste."

— Jimmy J. (1/5)

Great sound improvement

"Bought this to upgrade my older gmmk I had built 2 years ago. It is had a slightly nicer typing feel, it isn't too squishy like some others if you're worried about that, and they give you plenty of options to customize the feel. The biggest improvement for me is the sound."

— Nolan C. (5/5)

GMMK Pro Flexkit review

"I have purchased the GMMK Pro flexkit, I think in general the packaging and the instructions and accessories are clear and well packaged. However, the flexkit has not helped with the rigidness of the keyboard, it has gotten to my attention that the polycarbonate switch plate that I have purchased awhile ago was causing my PCB to be warped. It was not prominent with the stock kit as it was not able to flex anyway. But when I have swapped to the flexkit, it has made me realised that the bowing caused the flexkit to not work at all, i have tried multiple configurations, including removing both the back foam. However, to no avail, the centre portion of the PCB will not flex."

— Ryan (3/5)

If you are a first

"If you are a first time buyer and do not have a GMMK Pro already, do not buy this product in the configuration bundle! When ordering this product in the “configuration bundle”, their website advertises that you will receive the parts you build a complete product from the ground up. This is actually a lie as they only send you all of their replacement part kits as if you already had the product and simply needed to repair it. Ultimately what this means is that you receive the USB-C replacement kit, which doesn’t come with an M2-0.40 x 3.5mm machine screw or the 2mm foam cover. They expect you to reuse these parts from your original keyboard. What I ended up discovering is that these were the same size screws as the ones used to mount the stabilizers to the PCB, so you might be able to source an extra screw if you have any spares from ordering stabilizer kits. Luckily a co-worker has tons of these as he’s heavily invested into custom keyboards."

— Cory W. (3/5)

Upgrade my GMMK PRO

"I use G-Foam Plate Foam, Soft Poron Gasket Strips, 2mm Bottom Case Foam and Glorious Lynx Switches on my grovemade felt desk pad. It sounds very good and typing feel excellent."

— Totoro (5/5)

Massive upgrade

"Preview flex kit I was honestly not overly impressed with the Pro keyboard. I was like trying on concrete. No flex or give at all. With the flex kit it is honestly the best keyboard I have ever used."

— Ross L. (5/5)

Does not make any difference.

"I did not saw any difference on flex, keyboard is still "tight"."

— George A. (1/5)

Q&A

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