All these they are to put in a leather cover, and put it on the frame.
Referenced Verses
Num 4:6 : 6 And putting over it the leather cover and over that a blue cloth; and putting its rods in place.
Num 4:12 : 12 All the vessels which are used in the holy place they are to put in a blue cloth, covering them with a leather cover, and put them on the frame.