Teacher:In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Teacher: Now, understand the problem? Solve this instance: Passage: Due to a double election of Francois Louis, Prince of Conti and the Frederick Augustus I, Elector of Saxony (elected King of Poland as Augustus II) in 1697, the two claimants to the Polish throne had serious troubles with obtaining approval of the nobility for their coronation. The most difficult situation was of Elector of Saxony, who had no support of the primate Micha Stefan Radziejowski and most of the senators holding the custody of the Wawel Castle Crown Treasury. Therefore, expecting obstacles in obtaining the royal insignia, he ordered to prepare replacements before his arrival to Krakow. On the eve of the ceremony, some of the gathered decided to find a way to obtain the original regalia. Two monks Aleksander Wyhowski, prior of Czerwinsk and Mikoaj Wyzycki, prior of the Holy Cross made a hole in the castle's wall and got to the vault from which they stole the crown, scepter, sword and orb. The Dresden regalia become unnecessary, Augustus II the Strong, however, treated them as a private insignia.
Link Information: three silver orbs Answer: silver
Student:
What was the round object stolen from the vault made of?