Cherry MX Rubber ORing Keyboard Switch Dampeners Blue 40A-R - 0.4mm Reduction (125pcs O-Rings)

I received and installed my dampeners today. Not nearly as hard to install as some indicated in other reviews. They make a significant difference in sound but that also results in a difference in feel. There seems like a significant difference in how quickly the key hit bottom and initially is enough that some characters are not being entered despite a click from the switch. This results in what my wife calls angry typing where I smash the heck out of every key. I am currently attributing this to the fact that they are new and I am ust getting used to them/wearing them in.Am giving a 4 star for now and will increase to 5 later if the missing character thing improves.Update: I have had these on for about a month, maybe longer, and I am very pleased. The missing character thing stopped as I kind of expected it would, and I have really grown to like the shorter key travel. Increased to 5 stars.Edit2:I have had the dampeners on for several months now and they at this point have felt exactly the same after initial wear in period. They continue to not only improve the sound of using my keyboard, they also improve performance from a keyboard I was already more than happy with in the reduced travel path. Do it. Worth every cent and then some

I bought these to install in a CM Quickfire Rapid keyboard with Cherry MX Red switches, and am very pleased with the new feel. Previously bottoming out each key resulted in a loud plastic "whap" noise, but with these rings it's more of a solid "thud" that feels much better. There is no interference with travel other than at the very bottom. Overall the keyboard is -much- quieter. The o-rings seem very durable. It's just a wee bit tedious to install them all, but overall it's not too time-consuming (note: you can't do it without a keycap puller tool). The only tricky part might be the stabilizer supported keys like control, return, and the spacebar, if you haven't done it before. The WASD keyboard folks have a helpful video on their site, under Support->Tutorial->Removing Cherry MX Keycaps, which shows how to remove and reinstall keycaps with stabilizers. The price of this little baggie of tiny blue washers is a bit steep, but they definitely provide a noticeable and qualitative improvement when you type. Comparing these to the red o-rings, which are half the thickness, I would speculate that the red dampeners would convert the "whap" to a "thud" but with a much less cushion-y feel, and you would not notice them as much when you bottomed out. I'm glad I got these, as it makes the keyboard feel more solid, somehow.

These turned out to be the absolute ideal thickness and pliability for use with my Das Keyboard Professional 4 with Cherry MX Brown key-switches. Installation takes time and a little finesse. If you don't have a keycap puller, order one at the same time.Originally I ordered the red o-rings which are a little thinner. But I found that they didn't provide quite as much dampening as I wanted, so I gave them to a friend and ordered these.Whereas the "red" o-rings still allowed some clatter sound to come through when my keystrokes bottomed out, the blue o-rings dampened the bottom-out enough that there's no clatter under normal typing conditions. The feel is nice too. I've heard some people describe the tactile response of the blue o-rings as mushy. That's not been my experience. I find they reduce the keystroke travel only a very small amount, and they provide a softer landing without compromising the tactile feedback of the MX Brown switches.My friend to whom I gave the red o-rings has a different brand keyboard with Cherry MX Blue switches. He finds the reds to be ideal in that application. So I suspect that there may be subtle differences in the under-side of the keycaps of different brand keyboards, and that difference rendered the red o-rings insufficient for my Das Keyboard Pro 4 with MX Browns, and rendered the blue o-rings a perfect match.That being the case, I suspect that occasionally a little experimentation is a good idea.