What is U in badminton racket?

U represents the weight of the racket while G represents the length of the racket. Each racket should be marked with its weight. Most badminton rackets manufacturers use 1U, 2U, 3U, and 4U to indicate the weight of the rackets with 1U being the heaviest and 4U the lightest. ... 5U: The weight is 75-80 grams.