What is the name of the metal gong-chime instrument, consisting of 18 small knobbed gongs in a circular frame?

• A Khong wong lek
• B Khong mong
• C Khong wong yai ✓
• D Khong hui

The khong wong yai is a set of 18 tuned bossed gongs arranged in a circular rattan frame, the melody-leading instrument in the piphat classical ensemble.