In Chongqing, Wansheng Economic and Technological Development Zone Museum collected a suona horn “Qing Shan Mang”. The total length of the horn is 4.5 metres, with the diameter of mouthpiece 1.8 metres. The suona horn is made from bamboo, wood, ox bones, hemp, gypsum and other materials. The World Record Certification Agents performed on-site authentication and verified the “Qing Shan Mang” the biggest suona horn in the world.