from the site..."made from a unique blend of recycled plastic and natural wood fibers." ..."It is stronger than either wood or plastic barrels. The material will never rot, which means, among other things, that the bottom will never fall out."
Well you weren't completely wrong there is wood fiber in there, sorry about that, I was a bit cranky.
Anyway they won't rot, they seem just like molded plastic to touch, but look like a real barrel.
16 inches high, 23 inches across. We con't have a calculator here for round containers, I'd say it holds 25 gallons or so.