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

Description

🔵 Quiet comfort meets pro-level durability — type like a Captain!

BUILT TO LAST - premium EPDM rubber resists cracking and tearing over time
WHISPER QUIET WORKFLOW - dramatically reduces keyboard noise for focused productivity
EFFORTLESS INSTALLATION - quick 4-5 min setup keeps you typing without downtime
BONUS SCREEN CLEANING CLOTH - keeps your workspace pristine and professional
SOFTER KEYSTROKES LESS FATIGUE - 0.4mm travel cut for cushioned typing comfort

Captain O-Ring Blue Keyboard Switch Dampeners reduce key travel by 0.4mm to soften keystrokes and minimize finger fatigue while significantly lowering typing noise. Made from high-quality EPDM rubber, these 135-piece dampeners resist cracking and tearing for long-lasting performance. Included is a microfiber screen cleaning cloth, all packaged for easy installation and backed by a one-year warranty.

Specifications

Brand	Captain O-Ring
Manufacturer	Captain O-Ring LLC
Colour	Blue
Item Height	0.5 Inches
Item Width	3.6 Inches
Product Dimensions	17.78 x 9.14 x 1.27 cm; 4.54 g
Item model number	BC72657
Hardware Platform	Laptop
Are Batteries Included	No
Manufacturer	Captain O-Ring LLC
Country of Origin	USA
Item Weight	4.54 g

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Received my product in pristine condition. Great service overall.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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