what are the boxer weight classes?
['light flyweight, not more than 108 pounds (49 kg)', 'flyweight, 115 pounds (52 kg)', 'bantamweight, 123 pounds (56 kg)', 'lightweight, 132 pounds (60 kg)', 'light welterweight, 141 pounds (64 kg)', 'welterweight, 152 pounds (69 kg)', 'middleweight, 165 pounds (75 kg)']