The lightweight division is the 130 pounds (59 kilograms) to 135 pounds (61 kilograms) weight class in the sport of boxing. Notable lightweight champions include Ray "Boom Boom" Mancini, Roberto Duran, Hector Camacho, Julio Cesar Chavez, Benny Leonard, Joe Gans, Henry Armstrong, Tony Canzoneri, Carlos Ortiz, Ike Williams, Alexis Arguello and Floyd Mayweather .