The AKG PF80 is a generic Pop-Filter that will clamp onto your studio microphone stand. A Pop Filter is used to stop you sending harsh sounds from your mouth, into your studio microphone.
When using a high end studio mic that is very sensative, these work to give you a much more balanced sound as it really does filter out any harsh 'p' 's' and 't' sounds!
If you work with microphones in your studio, you need one of these!