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 - Rubber Oring Keyboard Switch Dampeners Blue [40A-R 0.4mm] Reduction (135 pcs w/ screen cloth)

Captain O-Ring - Rubber Oring Keyboard Switch Dampeners Blue [40A-R 0.4mm] Reduction (135 pcs w/ screen cloth)

Product ID: 210138655

Details

Brand
Captain O-Ring
Compatible Devices
PC Laptop
Connectivity Technology
USB
Keyboard Description
Mechanical
Special Feature
mechanical

🔇significant sound dampening

🔵0.4mm travel reduction

🛡️durable EPDM rubber

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Description

🔵 Quiet keys, sharp minds — type like a pro without the noise!

BONUS CLEAN - Includes Captain O-Ring branded microfiber cloth to keep your screen spotless.
BUILT TO LAST - Premium EPDM rubber resists cracking and tearing for long-term durability.
FATIGUE FIGHTER - Minimize finger strain by softening every keystroke impact.
SILENT PRECISION - Slash keyboard noise with 0.4mm travel reduction for whisper-quiet typing.
EFFORTLESS UPGRADE - Quick 4-5 minute install transforms your mechanical keyboard instantly.

Captain O-Ring Blue Keyboard Switch Dampeners reduce key travel by 0.4mm to soften keystrokes and significantly lower typing noise. Made from high-quality EPDM rubber, these 135 durable o-rings prevent cracking and extend keyboard life while minimizing finger fatigue. Easy to install and including a branded microfiber screen cloth, they offer a sleek, professional upgrade for mechanical keyboard users seeking a quieter, more comfortable typing experience.

Specifications

ASIN	B017HJMLDU
Brand Name	Captain O-Ring
Button Quantity	135
Colour	Blue
Compatible Devices	PC, Laptop, Mobile Device, Gaming Console
Connectivity Technology	USB
Customer Reviews	4.5 4.5 out of 5 stars (279)
Enclosure Material	Rubber
Hand Orientation	Ambidextrous
Item Type Name	keyboard
Item Weight Unit of Measure	0.01 Pounds
Keyboard Description	Mechanical
Keyboard Layout	QWERTY
Manufacturer	Captain O-Ring LLC
Manufacturer Part Number	BC72657
Model Number	BC72657
Number of Keys	135
Product Features	mechanical
Style Name	Blue
Switch Type	Mechanical
UPC	722589526244

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$78.64

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In stock

Sold byAmazon Northern Mariana IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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