Since you asked,

I have 4. They're all small, because I don't have much counter space. 3 are plastic. If I cut up raw meat, I put that in the sink and use a different one for vegetables. I also have a wooden board with adjustable handles, that I can put over the sink-- vegetables only, never meat, on that one. It's pretty handy.

I also have a big one (20 x 27 inches) that I only use for rolling out cooky dough and pie crusts.

Maryanne