Does 0.4mm in the specs mean 4 millimeters thick? 0.4 millimeters would be very very thin (i.e. less than half a millimeter).

Hello. The 0.4mm is not representative of the size of the o-rings, but rather the reduction in key-stroke travel with these installed. You are correct, the o-rings are thicker than 0.4mm :-). They are actually about 1.75mm thick.

So do you put these on the switch or the keycaps?

you put this on the keycap, on the post that is attached to the switch. As it descends into the switch it hits the switch face. Slightly shortens the travels and dampens the impact.

Does it come with a cap remover?

Hello, this kit does not include a cap remover. Most keyboard keys can be easily removed from the board with anything flat/thin enough to get under the keys and lift.

Will these work with gateron switches?

These should work with any removible mechanical key caps because they are applied to the stem of the key cap, not any part of the switch itself. There are great tutorial videos online if you Google how to apply o rings to key caps. Best of luck!

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Captain O-Ring Mechanical Keyboard O-Rings, Switch Dampeners, Blue 0.4mm

Product ID: 20598680

Details

Brand
Captain O-Ring
Color
Black
Compatible Devices
Keyboard
Connectivity Technology
USB
Included Components
135 x Rubber 1
Keyboard Description
Mechanical

🔇30% noise reduction

⌨️0.4mm travel reduction

🛡️durable EPDM rubber

฿1529

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⌨️ Elevate your typing game with silent precision and lasting comfort!

BUILT TO LAST - Premium EPDM rubber resists cracking and tearing, ensuring your keyboard stays smooth for years.
EFFORTLESS INSTALLATION - Quickly install on any mechanical keyboard in under 5 minutes—no special tools required.
CUT NOISE NOT PERFORMANCE - Slash keyboard clack by up to 30%—perfect for shared workspaces and late-night grind sessions.
COMPLETE KIT FOR INSTANT UPGRADE - Includes 135 O-rings plus a Captain O-Ring branded microfiber screen cloth for a clean, professional setup.
SOFTER QUIETER TYPING EXPERIENCE - Reduce key travel by 0.4mm for a cushioned, fatigue-free keystroke.

Captain O-Ring keyboard dampeners deliver a 0.4mm travel reduction that softens keystrokes and reduces finger fatigue. Crafted from durable EPDM rubber, these 135-piece rings cut keyboard noise by approximately 30%, creating a quieter, more pleasant typing sound. The package also includes a premium microfiber cleaning cloth, making it a complete upgrade kit for mechanical keyboard enthusiasts seeking enhanced comfort and sound control.

Specifications

Additional Features	Silent
Antenna Location	All
Asin	B017HJMLDU
Best Sellers Rank	#40,239 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #61 in O-Rings
Brand	Captain O-Ring
Built In Media	135 x Rubber O-rings, 1 Screen Cleaning Microfiber Cloth
Button Quantity	135
Color	Blue (0.4mm)
Compatible Devices	PC
Connectivity Technology	Usb
Customer Reviews	4.4 4.4 out of 5 stars (332) 4.4 out of 5 stars
Enclosure Material	Rubber
Eu Spare Part Availability Duration	1 years
Hand Orientation	Ambidextrous
Item Highlight	135 Pack, 0.4mm Travel Reduction, 40A-R EPDM Rubber, Softer Landing, Better Shock Absorption, Includes Screen Cloth
Item Weight	4.54 g
Keyboard Description	Mechanical
Keyboard Layout	QWERTY
Manufacturer	Captain O-Ring LLC
Mfr Part Number	BC72657
Model Number	Blue (0.4mm) 135pc
Number Of Items	135
Number Of Keys	135
Number Of Packs	1
Power Source	Wired
Style Name	Contemporary
Switch Type	Mechanical
Theme	Keyboard Accessories
Unit Count	1 Count
Upc	722589526244

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