These are older sets so they are made mostly out of wood.
The one on the right is pine. The top is 41" in diameter with a 14" leaf and 4 chairs. Very solid set, the base is all wood. This one could be made into one of those nice coffee tables if you'd cut the pedestal down.
The darker one on the left is 46" in diameter with two 11" leaves and 7 chairs, two captain and 5 side. It also is very solid and will seat a crowd with the leaves in.
Get ready for your holiday entertaining with a nice, new-to-you dining room set!