Hi to all

I want build a cnc machine like cnc machine that showed in below link.

http://www.youtube.com/watch?v=D9SZVdMA-u4]‪MACH5 5 Axis Dental Cad Cam‬‏ - YouTube

Can some one help me for know what material use for CNC bed ?
Can you please give me some information on CNC Bed? Like Material, size, Properties?


Thank you