Who knows the size of the piano chair? Tell me.

The general specifications of a double bed are: 75cm long, 36cm wide and 48cm high. Music box. The net dimensions of single lifting stool with box: length 55cm, width 34cm and height 46-56cm. Single specification: length, width and height =54cm*35.5cm*45.5cm (the height after elevation is about 55cm).