10.7MHz IF filter for FM radio

I have several questions for the channel selection filter of FM radio.

1) What's the material of it which we most often obtain?
2) What's the 3dB bandwidth of it?
3) What's the frequency response of it? Ex:butterworth or Chebyshev?
4) Which manufacture is better for this?

Thanks,

Here you can find the answer for all the questions:
http://www.geocities.com/rbrucecarte...mic_filter.htm