One hundred square meters can hold about fifty or sixty mahjong tables. 100 flat teahouse, which can hold 100 square meters, about 50 to 60 mahjong tables. Mechanical hemp is the abbreviation of automatic mahjong machine, which is used for machine shuffling. There is a magnet on the back to attract the magnetic steel in the machine plate. Due to the principle that like-sex attracts opposite-sex repulsion, the magnetic pole on the back of mahjong tiles attracts the magnetic pole on the front inside the big plate, thus achieving the function of the back facing upwards.