Are these pots any good

i have these pots and I believe they are concrete but unsure.
I won't be using them and want to advertise them but unsure what they are made of.
Any ideas please as concrete ones seem rather expensive and a shame to throw away.

 

Look like reconstituted stone and if so are worth a few quid. I hope theyve got drainage holes.

 

They all have a hole in the middle.