The Temple Institute: In-Depth Temple Study: The Contents of the Ark of the Covenant
 
The Contents of the Ark of the Covenant: Dimensions

The Ark consisted of three boxes, one inside the other. The outer box was made of gold; inside this was a wooden box, and within it, the innermost box was also made of gold. In this manner, the Ark was overlaid in gold from inside and out. (Source: Exodus 25, 10-22) 

Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII