Inside painting or inner painting,handmade

thickness 3.8cm, width 7.5cm, height 12.8cm, and weight 280g, 1 centimeter (cm) is equal to approximately 0.3937 inches. 

Inside painting, also known as "Chinese snuff bottle inside painting" or "bottle painting," is a traditional Chinese art form where miniature paintings are done on the inner surface of glass or crystal bottles. This delicate art requires great skill and patience as artists paint intricate designs using specialized brushes through the bottle's neck. The themes of inside painting often include landscapes, figures, flowers, and calligraphy, all meticulously rendered in reverse order due to the medium's transparent nature. This art form dates back to the Qing Dynasty (1644-1911) and continues to be practiced and appreciated today for its beauty and craftsmanship.