וּמַֽעֲשֵׂה֙ הָא֣וֹפַנִּ֔ים כְּמַעֲשֵׂ֖ה אוֹפַ֣ן הַמֶּרְכָּבָ֑ה יְדוֹתָ֣ם וְגַבֵּיהֶ֗ם וְחִשֻּׁקֵיהֶ֛ם וְחִשֻּׁרֵיהֶ֖ם הַכֹּ֥ל מוּצָֽק׃
And the work of the wheels was like the work of a chariot wheel; their axletrees, and their felloes, and their spokes, and their naves, were all molten.
Read kabbalistic (mystical) interpretation of I Kings 7:33: and classical mystical sources.