Wax is burned out of the flask in a kiln over a period of several hours depending on the size of the flask. This size takes 5 hours to completely eliminate the wax: the temperature is set to 300F for 1 hour, 700F for 1 hour, 1350F for 2 hours, then back down to stabilize on the casting temperature for at least an hour which is 900-1000F for silver. Intricate molds are cast hotter so the metal can work its way into the finer parts. These beefy rings are generally cast at the lower end of the range for silver.