Does the subject want to ask, "What is the size of each wall brick in Wumaomen Park?" ? Length 40 cm, width 20 cm and thickness 10 cm. According to the inquiry of Nanjing Municipal People's Government, in Nanjing Wuchaomen Park, the bricks of Nanjing Mingcheng are 40 cm long, 20 cm wide, 10 cm thick and weigh 10-20 kg. Bricks with consistent regulations are piled together with superb skills, which makes the Ming city wall stand the test of time.