Source: Classical literature
Teišun-i giyan is a brass or bronze rod-mace.1
They are much rarer than their iron or steel counterparts called sele-i giyan and they tend to be of better overall quality.
A fine bronze mace. Sold by Mandarin Mansion in 2019.
1. Tongwen Guanghui Quanshu (同文廣彙全書) or "Enlarged and complete dictionary" of 1704. A Qing imperial dictionary in Chinese and Manchu, each entry double-checked and approved by the Kangxi emperor.