From lightest to heaviest: Strawweight Light Flyweight Flyweight
Super Flyweight Bantamweight Super Bantamweight Featherweight Super
Featherweight Lightweight Super Lightweight Welterweight Super
Welterweight Middleweight Super Middleweight Light Heavyweight
Cruiserweight Heavyweight The names varies in each organization.
ie: Super Welterweight could also be call Junior Middleweight.