Three inches. The Dormitory is a variety show, which tells the wonderful dormitory life of seven teenagers: Zhu Zhixin, Su Xinhao, Deng Jiaxin, Zhang Ji, Zuo Hang, Zhang Zeyu and Zhang Junhao. The program released three generations of small cards about these teenagers, the size is 3 inches, and the price ranges from 20 yuan to 40 yuan, which can be purchased online.