The racket T40T45 is the weight it can bear per square centimeter.

How many T refers to the weight that each square centimeter can bear, 40T means that each square centimeter can bear the weight of 40 tons, and 45T means that each square centimeter can bear the weight of 45 tons.

Badminton is an indoor and outdoor sport. Depending on the number of participants, it can be divided into singles and doubles. A badminton racket generally consists of a racket head, a racket shaft, a racket handle, and a joint between the racket frame and racket shaft. The length of a racket does not exceed 68 cm, of which the length of the racket handle and racket shaft does not exceed 41 cm, the length of the racket frame is 28 cm, and the width is 23 cm. With the development of science and technology, the development of rackets is becoming lighter and lighter. , the racket frame is becoming harder and harder, and the racket shaft is becoming more and more elastic. Suitable for the development of Eastern people.

Modern badminton originated in England. In 1873, there was a Duke named Beaufort in the town of Bloomington in Glasgow County, England. He held a garden party in his territory. Several retired officers who had returned from India introduced a method of using a racket across a net to fight back. People are very interested in the game of shuttlecock. Because this activity is extremely interesting, it quickly became popular in the social circles of the upper class. "Badminton" became the name of badminton in English. In 1893, 14 badminton clubs in the UK formed the Badminton Association, the predecessor of the All England Open. Since 1992, badminton has become an official event in the Olympic Games.