How is this sound made in sax?

the sound is made by when you blow into the mouthpiece, the reed vibrates up and down creating a noise. there is no variation. you just blow into it, and open or close the keys. and by material do you mean the reed. If you mean the reed, then no. all reeds are made out of wood. just the thickness of the reed alters the tone quality, but also how hard it is to play it.