Largest gong

According to Official Guinness Records,

The largest gong measures 5.15 m (16.8 ft) in diameter. It was made by Shanxi Baodi Real Estate Development CO. Ltd and displayed at the Third China Taiyuan International Cooked Wheaten Food Festival, Shanxi Province, China on 8 September 2005.
the gong was made of copper and weighed 568 kg (1252 lb).

For a complete list of 2005 records, please visit 2005 Guinness Records in China.

Other China records that might interest you:

• Largest simultaneous balloon popping
• Largest collection of monkey-related items
• Largest rotating three-sided billboard (advertisement)
• Largest jigsaw puzzle spherical
• Most populated province