וְעַמֻּֽדֵיהֶם֙ אַרְבָּעָ֔ה וְאַדְנֵיהֶ֥ם אַרְבָּעָ֖ה נְחֹ֑שֶׁת וָוֵיהֶ֣ם כֶּ֔סֶף וְצִפּ֧וּי רָאשֵׁיהֶ֛ם וַחֲשֻׁקֵיהֶ֖ם כָּֽסֶף׃
And their pillars were four, and their sockets four of brass; their hooks of silver, and the overlaying of their capitals and their fillets of silver.
Read kabbalistic (mystical) interpretation of Exodus 38:19: and classical mystical sources.