The tower contains four bells within the peristyle. These include a B♭ bell on the west, a E♭ bell on the east, a F♮ bell on the north, and a G♮ bell on the south. The bells were the highest in the world at the time of their construction. These are respectively struck by hammers weighing 94, 71, 61, and 54 pounds (equivalent to , , , and kg respectively). A fifth hammer, weighing , strikes the 7,000-pound bell each hour. The smaller hammers strike the bells every 15 minutes. On weekdays between 9a.m. and 10p.m., and on weekends between 10a.m. and 10p.m., the bells played "I Know That My Redeemer Liveth" every 15 minutes. The bells were not given nicknames: rather, Metropolitan Life referred to each bell by its cardinal direction.