These are pretty cheap keycaps to be honest. Some of them have a few marks around the edges showing that the plastic has been put into the mold. But overall I'm very happy with them. I use them on my Corsair K68 RGB with Cherry Red switches. They generally fit very well, except for one small issue: the row of keys leading from one Ctrl key to the next didn't fit because Corsair used a different key size and switch spacing when these keycaps were designed, but it does not really like that. My original keycaps felt very smooth even when they were new and at times I thought my fingers would slip off the keys, but they have a bit more texture and that completely solves this problem for me. In fact, I'm much more comfortable typing on the keyboard. This is personal preference, so keep that in mind. All in all, I recommend them if you don't mind that some capital letters (like the ones in the bottom row) can't be replaced with them.
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