The first players were metal. These were included in the first sets in 1949.

I have two of these sets in my collection. One is with red and yellow players, the other, slightly harder to acquire, is with blue and white steel colored players.
In 51 the molds were changed to plastic to the first series of figures.

From my set.
Now this the TUDOR brand. Other brands like Gotham and Coleco (yes before the handheld electric) made games too.
But Tudor has been and is today, the KING :)