The Fed charges $1.75 to move each bar of gold. Gold bars are moved between the compartments whenever one account holder pays another. Staff wear steel-toe footwear to protect their feet in case they drop one of the gold bars weighing . Every time the compartments are opened or gold is moved, three Fed staff members are required to oversee the transaction. Each compartment is further locked behind a padlock, two combination locks, and the seal of the Fed's auditor. The Fed does not publicly record whenever gold bars are moved in and out of the vault, and no one except account holders or auditors is allowed to look at the bars. While the Fed does conduct public tours of the vault, visitors are only allowed to see a display sample of gold.