an AKG C 414 EB

Condenser mic with 4 selectable polar patterns (carioid, figure-8, omnidirectional, and hypercardioid), 0/-10/-20 dB attenuation selector, and 3-position bass rolloff switch (at 0, 75 and 150Hz, 12dB/octave).
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Mentioned in Kerry's first "Tech Tuesday" blog post on 2009/09/15 as part of a run-down of mics used to capture Mike's drum sound:

On the top of the Snare we are using 2 microphones: a Shure Sm57 (this microphone has been used on almost every rock record ever recorded), but we have found that with an AKG 414 EB placed by its side the snare has a bigger sound then usual and yet stays very true to the sound we hear in the room.
On the Snare bottom we are using an AKG 414 EB (we use this mic as needed to grab more of the "snare" sound from the drum)