"Preussen" was steel-built with a waterline length of 124 m and a total hull length of 132 m. The hull was 16.4 m wide and the ship had a displacement of , for an effective carrying capacity of . The five masts were fully rigged, with courses, upper and lower topsails, upper and lower topgallant sails, and royals. Counting staysails, she carried 47 sails (30 square sails in six storeys, 12 staysails between the five masts, four foresails (jibs) and a small fore-and-aft spanker) with a total sail area of (according to other sources , which probably refer to the square sail area only). Not only the hull was steel: masts (lower and top mast were made in one piece) and spars (yard, spanker boom) were constructed of steel tubing, and most of the rigging was steel cable. All bobstays between jibboom and bow were made of massive steel rods and chains. The only wooden spar was the gaff of the small spanker. The hoistable yards were equipped with special shoes to slide in rails riveted to the masts. "Jarvis' Patent" brace winches for the lower and top-sail yards were mounted before each of the five masts. The fall winches were of "Hall's Patent".