What materials are used for the 2021 Xuzhou Marathon medals?

It should be zinc alloy.

Common marathon medal materials: made of aluminum, iron, zinc alloy, copper, gold, silver and other materials, and also made of stone, wood, resin, and organic materials. It is usually zinc alloy, with electroplating on the outside, gold, silver or copper or other colors. The design of the 2021 Xuzhou Marathon medals this time is also very meaningful, closely following the Xuma theme of "Eternal Dragon Enclave, Runner's Dream City". Xuzhou is the hometown of a generation of emperors and has a very rich historical and cultural heritage. The medals in this event organically combine the cultural treasures "totems" of the Han Dynasty with Xuzhou's landmark buildings "Olympic Sports Center, Huai Pagoda, and Yunlong Lake Concert Hall", making the ancient charm History and modern civilization are vividly displayed.