Cherry MX Blue
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DO NOT LUBE
Click jacket clickies (like the MX Blue) do not take well to lube, and in fact, lose their click much of the time. Do not lube.
The MX Blue is the overall representative of modern mechanical keyboards everywhere. It is a mid-weight clicky switch made by Cherry. For most laymen, it is what comes to mind when thinking about a mechanical keyboard. While there have been many new options in the clicky space many average everyday people still use these and they've got a nice crispness that can't be emulated by anything that's not clicky.
Don't lube them though. Lube of a huge variety gunks up the click jacket and just makes them feel completely different.