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Great addition to my Razer Huntsmen Tournament Edition keyboard. Some keys had multiple stems, I used 2 o-rings per stem. Number of rings needed for your board and preference will vary.
Don't expect a dramatic sound difference. It is quiter but not by huge degree. The feel is a more noticeable difference. You get slightly less travel and a nice cushion when bottoming out. Overall my board is quiter and feels alot better to me.
I installed these easily, O-rings appear to be in perfect condition, shipped fast, etc. No complaints on that end.
However, after installation I noticed no reduction in sound volume from my keys. Whether this is a result of my keyboard just being designed poorly or O-rings having some magical property I've yet to understand and implement, I don't really know.
I should have done more research and I would have discovered that most loud mechanical keyboards at best are reduced only marginally.
I will keep them for possible future use, but overall very disappointed in the fact that they did not work. I would have rather put the money towards a new keyboard.
my keyboards with linear switches are really loud due to bottoming out. These o-rings help dampen out the sound by a lot. It also reduces key travel and its pretty noticeable and can be a good or bad thing depending on what you prefer. However, when bottoming out it feels kinda mushy and not solid on each keypress and that might be the tradeoff for the noise reduction.
I bought a Redragon K551 a few months ago but the plastic on plastic clack was annoying. For a few dollars, this quiets the clack and actually improves the typing feel. They are simple to install and I've accomplished it in under an hour. Now I don't feel like I will keep the neighborhood awake when I write at night.
I installed these on an iKBC CD108BT with Cherry MX Brown switches and the stock keycaps. They fit perfectly, reduced the volume significantly, and make typing more pleasant (I think the switches bounce back upwards a little faster, which I enjoy). Highly recommended if you're working in an office environment.
At least for my Monoprice mechanical keyboard these were unusable. It was a fair bit quieter after installation but the amount you had to press down on certain keys and the sticking that would occur made these a no go for me. Then again if you're looking for a cheap solution to your keyboard noise maybe they'd work better on your particular keyboard model. Its a roll of the dice.