I used this on an Eagletec keyboard with blue switches. Firstly 2 of the 120 pieces were broken, no big deal but they should be enough for a full mid-size keyboard plus a few extras for those occasions. I have completed 3/4 of my keyboard with the package that came with it. Also, they would work better if they were cylinders rather than rings. You will need at least 3 rings to cover the LARGE portion of the stem on each key (larger keys have 2-3 stems, smaller keys have 1). If you put 3 rings on the stem and change the key and then press, the rings will slide over each other which frees up more space on the stem which reduces key ringing. This also causes the keys to sit unevenly. I need to order another pack of these to finish the job. I wouldn't say it made a huge difference to the sound, but the switches on this keyboard are insanely loud. I refuse to give up the keyboard because the light settings are so beautiful.
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