These are one owner, vintage, belonged to my Mother.  I do not remember her using them, BUT, one of the wagon wheels has come off. They are a hard plastic, not sure what happened to it, possibly came that way. The shaft part of the wheel that fits onto the metal rod is still there, it just has a tiny piece missing. It could probably be glued on with super glue, but probably would not roll. I feel that because of their age it would not be a good idea to roll them anyway, plastic tends to become a little brittle with age. Also, the foam pieces where glasses sit are aged too, but they are 60 years old! Each wagon is 4.75 inches in length and 3 inches wide.