Solid wood frames, with a removable seat, the seat has a fake leather top and metal springs, with some padding.
We got them in the late 70s second hand, so they must be 50 years old.
They are still solid and sound, but the seats need re-upholstering (see photos).
There are websites that will sell you the supplies, such as
https://www.jamiltonupholstery.co.uk/
https://www.upholsteryshop.co.uk/
I have not used these shops, so this is NOT a recommendation.
The size of the chairs is
87cm high, 45cm deep, 45cm wide
Seat size including surrounding wood
38cm deep, 45 narrows to 37 wide, 46 cm from ground
To fit two in a car, seat to seat you'll need a space about
100cm high, 60cm deep, 45cm wide