John Gill Commentary Exodus 35:12

"the ark, and the staves thereof, the mercy-seat, and the veil of the screen;" — Exodus 35:12 (ASV)

The ark and the staves thereof
To carry it with, which were all made of shittim wood:

[with] the mercy seat ;
made of pure gold; these were set in the most holy place:

and the vail of the covering ;
which divided between the holy and the holy of holies; of these see (Exodus 25:10–22) (Exodus 26:32Exodus 26:33) .