Here are some examples:
however... if you pay attention, a voiced sound goes with a voiced sound, and... of course, a voiceless sound goes with another voiceless sound.
VOICED sound: z sound
you can feel it on your nose or throat
He has got a ten!
It seems you have a...
VOICELESS sound: s sound itself:
you feel nothing
It develops ...
It hits ...
It stops ...
I took this from an old book: A COURSE OF ENGLISH PRONUNCIATION. By J. D. O'Connor.
(s) is a voiceless sound, hissing sound, and (z) a voiced, buzzing sound. This difference apart they are both made in the same way, with the tip of the tongue very close to the palate a little way behind the teeth, so that the air has to force its way past and make the noise of the sounds.
To have a closer look at the details, this webpage certainly helps out: