Exodus 27:16-19

16“For the entrance to the courtyard, provide a curtain twenty cubits That is, about 30 feet or about 9 meters long, of blue, purple and scarlet yarn and finely twisted linen—the work of an embroiderer—with four posts and four bases. 17All the posts around the courtyard are to have silver bands and hooks, and bronze bases. 18The courtyard shall be a hundred cubits long and fifty cubits wide, That is, about 150 feet long and 75 feet wide or about 45 meters long and 23 meters wide with curtains of finely twisted linen five cubits That is, about 7 1/2 feet or about 2.3 meters high, and with bronze bases.

19All the other articles used in the service of the tabernacle, whatever their function, including all the tent pegs for it and those for the courtyard, are to be of bronze.