Difference between 0.2 and 0.4mm O-Rings - Peripherals - Linus Tech Tips
WASD Keyboard Unboxing Brown vs Blue plus O-rings - YouTube
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Keeping it (relatively) old school with my first semi-serious mech. WASD V1 with MX Blues, Black O-Rings, and Classic Beige and Grey Keycaps (thanks /r/mechmarket!) - Album on Imgur
KEYBOARD SCIENCE!] How much do O-rings affect keyboards with Cherry MX Blues/Greens? [FIXED] : MechanicalKeyboards