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For a variety of reasons (largely historical), weight classes of the same name can be of vastly different weights. For example, a boxing middleweight weighs up to 72 kg (160 lb), an ISKA middleweight upper limit is 75 kg (165 lb), and a K-1 middleweight upper limit is 70 kg (154 lb).
Established at 122 lb (55.3 kg) in 1920 by Walker Law; recognized in 1976 Super Flyweight: 112–115 lb (50.8 - 52.2 kg) Established at 115 lb (52.2 kg) in 1920 by Walker Law; recognized in 1980 Light Flyweight: 105–108 lb (47.6 - 49 kg) Established at 108 lb (49 kg) in 1920 by Walker Law; recognized in 1975 Strawweight: 105 lb (47.6 kg)