1, the sleeves of ancient hand warmers are called hand stoves, which are small stoves used for hand warmers in winter, mostly made of copper. It is a kind of heating tool commonly used by the ancient courts and people in China, which is opposite to the foot stove. Because it can be held in the hand and caged in the sleeve, it is also called "hand", "holding furnace" and "sleeve furnace".

2. Handmade furnace evolved from brazier, consisting of furnace body, furnace bottom, furnace cover (furnace cover) and lifting beam (handle). From the beginning of the Tang Dynasty to the middle and late Ming Dynasty, the handicraft of the hand-made stove reached the state of perfection. After the late Qing Dynasty, manual technology began to decline. In the early 1950s, there was a small amount of production in Jiangsu and Zhejiang provinces. With the progress of society, handwork has gradually lost its use value, but its historical value and artistic value have attracted more and more attention and become a favorite work of art for collectors.