He made the poles of acacia wood and overlaid them with bronze.
Referenced Verses
Exod 25:6 : 6 oil for the light, spices for the anointing oil and for fragrant incense,
Deut 10:3 : 3 So I made an ark of acacia wood and carved out two stone tablets just like the first ones. Then I went up the mountain with the two tablets in my hands.